https://focusonphysicaltherapy.com/sastm daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645914761042-DPE4CLIHDXTR3DIQAG2L/SASTM+Lower+Extremities.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645914835722-3092YGBW44P5WVH43SJC/SASTM+Upper.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645915211955-90JRH7BIH0GGFQJQX0UB/SASTM+Cost.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596477348456-U1PI92HODBO9O9T3T5A2/73B062C6-10B0-4B35-B47B-F0C1A14999DB.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596477314828-IH9BSWZ2ILPUF1DUKPT3/5DDE2C12-4569-4D87-AC9A-C4E0DCFDC1F0.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596477319944-5VHHWSOUJB5DDS1JSDWH/9BB565AC-E0DC-4ED5-8450-5DEF3CE397EA.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645916075710-R3L2H0TL4AN0X6762BSW/22D5C267-4001-4A03-A904-D5BC3B988112.jpg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645916106694-6A3JZPUFOA3X0O1QA9XO/B765031B-7870-41D2-994F-6AFC360DA951.jpg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596477310004-ZBYV3RXPUK8ID91NZDI4/55409CF3-B031-4E2F-BEE2-CD1A6BBBBAE2.jpeg SASTM https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/40e15cae-26fd-41a7-b217-4e85c66da259/sastm+banner+trans.png SASTM - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://focusonphysicaltherapy.com/home daily 1.0 2025-10-07 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645070994899-2SXN50GXN8I3KODSF28D/Outpatient+Focus.png Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645071504141-N7ST2BVF0HO5ZB73R9BU/unsplash-image-9HI8UJMSdZA.jpg Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645072771615-ICJUXRMUESRSZVY0963W/unsplash-image-RJCslxmvBcs.jpg Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645073521622-X065M65VY5OI08TC9M4N/SASTM.png Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645073641071-6CFCHBXRDJDBWMR15CR6/unsplash-image-Pdea8oxLHkU.jpg Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336313543-0X8PYLHRFW9XFOYC6B8K/20374878-CE9A-4BA8-BA5B-46E92AFCAA03.jpeg Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645940393740-NAUCYIHPQ8EW2SOUGRHK/unsplash-image-1rdB14ttWgQ.jpg Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1c4c1d7f-be62-470a-a2d5-29c71a27767c/Elite+Golfer+in+Action+on+Course+%281920+x+500+px%29.png Home https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/70a70405-c888-4364-b152-6e1c9fa8cf5d/Untitled+design-4.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/fd512fe3-d6b3-4ead-8040-45d2fae6ab5d/Focus+contact+poster.png https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/e7f9434f-d175-49f9-ab80-cb2b42f7ee3f/playlist.m3u8 https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/e7f9434f-d175-49f9-ab80-cb2b42f7ee3f/thumbnail Home Home https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/d4582e1d-4a18-4536-a31d-b36fa449e9f5/playlist.m3u8 https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/d4582e1d-4a18-4536-a31d-b36fa449e9f5/thumbnail Home Home https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/4b7ba707-2d21-4406-abb4-8a64aa27fa9b/playlist.m3u8 https://video.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/4b7ba707-2d21-4406-abb4-8a64aa27fa9b/thumbnail Home Home https://focusonphysicaltherapy.com/830laser daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1618497259178-6XJGK9GR6YAVBQL5L519/20140301_Trade-151_012-2.jpg 830LASER https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694583486-2PQT0LQ193RL7MCB6DX4/20140228_Trade+151_0046.jpg 830LASER https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694644871-IC85FNH781UNZSZEGHDR/Aro+Ha_0428.jpg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336312503-DRTAQETDLXFM492V6P0F/6D955C86-8973-4ADB-B868-3AE7B155873E.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336311416-SPBCCETCZ60E8UDQSOXQ/7400B52A-71B5-4181-B975-9231B38589D5.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336313543-0X8PYLHRFW9XFOYC6B8K/20374878-CE9A-4BA8-BA5B-46E92AFCAA03.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336312023-IA6XSPO81ENIX2USEKR3/86A5F7E6-3F30-4908-83CC-BBDA8487785A.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336309995-3E8EII8HB91O7U8M4A71/C0295457-2065-4EFC-841D-737158989423.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597336308039-WXOGCA3LN473LT843998/DDE6312F-8C29-4843-BA7D-B0DF3FD64599.jpeg 830LASER https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png 830LASER - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596562293367-57H5HS2MS62XK6NI5GFS/4B06571B-EF55-4FF7-877F-A9C60780F7D6.jpeg 830LASER https://focusonphysicaltherapy.com/patient-forms daily 0.75 2022-07-19 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1658264241491-DGYH2X89KI7XJ6BPO69N/Focus+Logo.png Patient Intake Forms https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1658264256066-4KWWKBY89GSP8VXSE75S/Focus+Logo.png Patient Intake Forms https://focusonphysicaltherapy.com/opt daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1618497259178-6XJGK9GR6YAVBQL5L519/20140301_Trade-151_012-2.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694583486-2PQT0LQ193RL7MCB6DX4/20140228_Trade+151_0046.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694644871-IC85FNH781UNZSZEGHDR/Aro+Ha_0428.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607638148090-Y6OFDI575CM3NQV732RJ/Large+JPG-Aro+Ha_0387.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607628784608-5D22G9GPLHDSAB2IXC2G/Large+JPG-Aro+Ha_0638.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1589847743861-GWVMBPD7Z7WQRQL9IZZ8/Large+JPG-Aro+Ha_0380.jpg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596415383175-NVCFSEVNX3H7D2UII9Y3/69BE50A4-3627-4CA1-93D0-D0DA058A4DB7.jpeg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596415385889-9YHF24Q9MTTP3H7O0DXQ/135F8F6A-5093-4123-8D0A-A6F5ACBFA129.jpeg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596415385425-72X0B2LTY06K5QULGFDX/FEA52C03-285C-446E-91A7-83446ED0F2BC.jpeg Outpatient Therapy https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png https://focusonphysicaltherapy.com/art daily 0.75 2026-09-04 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788485597795-W4M0ZOWY632GUZLMGRKT/unsplash-image-buWcS7G1_28.jpg https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788485819214-MXNRENB1J87M7GD1TOB4/unsplash-image-fG0p4Qh_aWI.jpg https://focusonphysicaltherapy.com/ourstaff daily 0.75 2025-10-07 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1597024765119-DE77BBS492U70ZB6BW73/FFA57D2D-BA02-4E1C-81ED-B739E6A3E557.jpg Our Staff https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/433621a9-0c8e-4c42-9f1e-c7de4a3272d6/323894148_1366493667433284_1189607749022280992_n.jpg Our Staff https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/88a1e2e4-6ba0-486f-bdd3-b007062cac53/E5422B36-1202-4790-8098-15EC661A962F.jpg Our Staff https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/efcb1ee9-e26a-4295-a591-a48ff1a12bd2/unnamed.jpg Our Staff https://focusonphysicaltherapy.com/manualtherapy daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1618497259178-6XJGK9GR6YAVBQL5L519/20140301_Trade-151_012-2.jpg Manual Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694583486-2PQT0LQ193RL7MCB6DX4/20140228_Trade+151_0046.jpg Manual Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607694644871-IC85FNH781UNZSZEGHDR/Aro+Ha_0428.jpg Manual Therapy https://images.squarespace-cdn.com/content/v1/5ec321c2af33de48734cc929/1607638148090-Y6OFDI575CM3NQV732RJ/Large+JPG-Aro+Ha_0387.jpg Manual Therapy https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png Manual Therapy - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://focusonphysicaltherapy.com/sports-medicine daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596416582758-79XMQ3UP2I20B4SMQAXE/D192551D-4CD0-41F6-8FDF-AF930D8B2ECA.jpeg Sports Medicine https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596226993727-95ELEBL2Y907W38M226F/IMG_0167.jpg Sports Medicine https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788620245655-IJ9C7P28QKZ6U5ZCXOGN/unsplash-image-qZ-U9z4TQ6A.jpg Sports Medicine https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1658264256066-4KWWKBY89GSP8VXSE75S/Focus+Logo.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788620856128-XMIGEENPC40AJUQB82CG/unsplash-image-optBC2FxCfc.jpg https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788620923181-0XRPCCZVPM5D7XLBUKYZ/unsplash-image-5aBd9nCccRs.jpg https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1788621122746-Z8PL4419WL8WX0ELFTUD/unsplash-image-buWcS7G1_28.jpg https://focusonphysicaltherapy.com/focus-clinic daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426500094-Y7PH6HJ50S4LVA79PKIJ/23F3E04A-BE7D-4C99-B839-0EA2A44E123C.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426498637-EASRXBEOTDCH8G6RT2FZ/D1FE3718-ACDB-402F-8938-403CE77B48B0.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426499645-L5X5M0J5TBS90RBQ3Q5X/F6B32512-D058-4ECC-85FE-3F880F24ED14.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426499322-H2KL30FXORWUCG8JWN5F/B54B1E22-B441-4702-9DAC-EE9275E699DB.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426476815-262ZHBZCTFXWK8TZZNNF/FB02DDC4-B05B-43D4-8937-92C94F3FE691.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596426493758-OF6KQZN7NE70K0R9O7DO/ED788694-5FDD-430F-AD5E-F20D346BE983.jpeg Our Clinic https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/30c132bc-d87a-4bed-a9d5-2ded197cda48/135F8F6A-5093-4123-8D0A-A6F5ACBFA129.jpg https://focusonphysicaltherapy.com/success-stories daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png Testimonials - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://focusonphysicaltherapy.com/whypt daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1596403620005-ZB0L2F9D84BCINGJJ5KV/ChoosePT_ProvidedByAPTA.jpg Why Physical Therapy? https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645942396106-EI31QEQC4UMQ66VX6ECJ/unsplash-image-xG8IQMqMITM.jpg Why Physical Therapy? https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/0c6514c4-c58b-4202-938e-74990c9a8c54/Focus+Why+Physical+Therapy.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/fd512fe3-d6b3-4ead-8040-45d2fae6ab5d/Focus+contact+poster.png https://focusonphysicaltherapy.com/faqs daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png FAQs - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://focusonphysicaltherapy.com/dry-needling daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/a25eae3e-73fa-4ad9-a82c-9ae817925eef/dry-needling.jpg Dry Needling - What Is Dry Needling? Dry needling is a therapeutic modality for tissue inflammation, sensitive nerve tissue, scar tissue formation, tissue adhesion, and deficiency of blood and lymphatic circulation. The insertion of the needle results in a physical and biochemical stimuli by stretching and breaking up the soft tissue. Dry needling creates both local and systemic effects by restoring the tissue homeostasis and reduces the stress in the area. The restoration of tissue homeostasis allows for biological self-healing and self-repair. https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/46765139-5513-448b-a147-3fb543e7d76b/dry+needling+man.jpg Dry Needling - How Does It Work? Dry needling creates both local and systemic effects by restoring the tissue homeostasis and reduces the stress in the area. The restoration of tissue homeostasis allows for biological self-healing and self-repair. https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/7337c45d-19a0-4856-8ea5-25f3815c6a77/5249B981-9630-489F-8D36-22770E539AB9.jpg Dry Needling WHY WOULD I NEED DRY NEEDLING? Simply put, your time and money. Dry needling has shown to cut down on the overall time in therapy. Some therapists have been able to cut down their patient's total number of treatment sessions by about 15% and have had some patients only receive 2-3 visits with complete resolution of pain. Now, dry needling alone is not enough. Following treatment, it is recommended that corrective exercise is performed to retrain the treated areas how to function properly. https://focusonphysicaltherapy.com/cupping daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png Cupping - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645931506809-785R4A4X3TBYLYVAFBS6/38EA39F0-FBAF-461F-9F85-37281DD03C96.jpg Cupping - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645933249455-OMFR09WMRAB6W22DL596/unsplash-image-Pdea8oxLHkU.jpg Cupping - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://focusonphysicaltherapy.com/solostep daily 0.75 2023-12-10 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/70a70405-c888-4364-b152-6e1c9fa8cf5d/Untitled+design-4.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/049f3e13-716c-4dd6-9e3c-d0d1aac8b6b5/Screenshot+2023-12-04+at+8.09.10+PM.jpg https://focusonphysicaltherapy.com/hrv daily 0.75 2023-12-17 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/4c9c95e4-a1ec-44d5-b5d1-897263aeae73/Screenshot+2023-12-17+at+3.18.52+PM.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/8a04b926-459e-4c48-be25-f383b4f138a3/Screenshot+2023-12-17+at+3.18.41+PM.png https://focusonphysicaltherapy.com/neubie daily 0.75 2023-12-17 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/f77e43e0-222c-4f92-b727-4fa8563048cb/Focus+Logo.png https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/7dcf5010-f2d8-479c-b23f-b1cf968fd7e9/Screenshot+2023-12-15+at+6.05.51+PM.jpg https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/0e0b9794-aab7-41f5-80ed-cb0b0b8499ed/Screenshot+2023-12-15+at+6.03.34+PM.jpg https://focusonphysicaltherapy.com/new-page daily 0.75 2026-04-17 https://focusonphysicaltherapy.com/titleistperformance daily 0.75 2026-09-04 https://focusonphysicaltherapy.com/focus-on-physical-therapy daily 0.75 2022-02-17 https://focusonphysicaltherapy.com/focus-on-physical-therapy/pemf monthly 0.5 2022-02-17 https://focusonphysicaltherapy.com/focus-on-physical-therapy/services monthly 0.5 2022-02-17 https://focusonphysicaltherapy.com/focus-on-physical-therapy/p/chair-and-extremity-therapy monthly 0.5 2026-08-27 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645062694943-BP82PWOCCJ5OCR6WHJEW/PEMF+Chair+and+Extremity.png Focus on Physical Therapy - PEMF Chair and Extremity Therapy https://focusonphysicaltherapy.com/focus-on-physical-therapy/p/premium-pro monthly 0.5 2026-08-27 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645062168441-01C3HHJ11COHKLHT03XL/PremierePro.png Focus on Physical Therapy - PEMF Premium Pro https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645060508964-NPBW39MUXNCQX6YCRAEK/service-pemf-pro-P1140458.jpeg Focus on Physical Therapy - PEMF Premium Pro https://focusonphysicaltherapy.com/focus-on-physical-therapy/p/premium-pro-starter-pack monthly 0.5 2026-08-27 https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645062456468-4Y2XXQ3PWXAXHAEYMEG4/Premier+Pro+Starter+Logo.png Focus on Physical Therapy - PEMF Premium Pro Starter Pack https://images.squarespace-cdn.com/content/v1/5f237ee49304bc002d681936/1645060413334-VPL8LBI8U7VK6GLRSZIF/services-pemf.jpeg Focus on Physical Therapy - PEMF Premium Pro Starter Pack