| Fit Cloud Technology Ltd | Newcastle Upon Tyne | 2010 |
| Fit Club (Northwood) Ltd | London | 2017 |
| Fit Club Group Ltd | Leicester | 2025 |
| Fit Corp Limited | London | 2015 |
| Fit Directory Limited | Wolverhampton | 2022 |
| Fit Driven Ltd | Guildford | 2021 |
| Fit Factory (Glossop) Limited | Whaley Bridge | 2022 |
| Fit Factory (High Peak) Limited | Whaley Bridge | 2018 |
| Fit Factory (Larne) Limited | Belfast | 2016 |
| Fit Factory 24/7 Ltd | Bedford | 2025 |
| Fit Factory Brentwood Limited | Rochford | 2023 |
| Fit Fast UK Ltd | North Harrow | 2014 |
| Fit Father Revolution Ltd | London | 2017 |
| Fit Females UK CIC | Stoke-On-Trent | 2025 |
| Fit for ALL England CIC | London | 2025 |
| Fit for ALL New Co Limited | Hove | 2008 |
| Fit for Every Game Consultancy Ltd | Leeds | 2020 |
| Fit for Future Ltd | Glasgow | 2019 |
| Fit for IT Training Systems Ltd | Glasgow | 2015 |
| Fit for Life Gloucestershire Ltd | Gloucester | 2026 |
| Fit for Rescue Ltd | London | 2026 |
| Fit Gainz Ltd | High Peak | 2019 |
| Fit Guru Gym Ltd | Pontefract | 2019 |
| Fit Gym Ltd | Uxbridge | 2026 |
| Fit Habit Ltd | Barnet | 2017 |
| Fit Happens Ltd | Southampton | 2025 |
| Fit House Belfast Ltd | Belfast | 2022 |
| Fit House London Ltd | London | 2022 |
| Fit House North East Limited | Hartlepool | 2021 |
| Fit House Training CIC | Carrickfergus | 2024 |
| Fit Hub Limited | Crumlin | 2021 |
| Fit in Fitness Gym Limited | Prestonpans | 2018 |
| Fit in Life Limited | Chesterfield | 2019 |
| Fit Inn Limited | Hartlepool | 2018 |
| Fit Investments Limited | London | 2019 |
| Fit JAM Limited | Sunderland | 2016 |
| Fit Kids, Healthy Minds Ltd | Aldershot | 2022 |
| Fit KO Ltd | London | 2024 |
| Fit LAB (Brighton & Hove) Limited | Hove | 1993 |
| Fit LAB (Health & Fitness) Limited | Worthing | 2020 |
| Fit LAB (Lichfield) Ltd | Lichfield | 2017 |
| Fit LAB Nutrition Limited | Northampton | 2025 |
| Fit LAB Worthing Limited | Worthing | 2018 |
| Fit Labs Kensington Limited | Harrow | 2016 |
| Fit Missions Ltd | Bakewell | 2016 |
| Fit Mode Ltd | Mansfield | 2016 |
| Fit MUM Transformation Ltd | Leicester | 2020 |
| Fit N Funky Gym (Atherton) Limited | Manchester | 2017 |
| Fit Parent Nation Ltd | London | 2022 |
| Fit Parks Ltd | London | 2012 |
| Fit Performance Ltd | Basildon | 2013 |
| Fit School Limited | Epping | 2013 |
| Fit Sisters Ltd | London | 2016 |
| Fit SIX Training Ltd | Magor | 2021 |
| Fit Space Chelsea Ltd | Crewe | 2017 |
| Fit Space Ltd | Edinburgh | 2018 |
| Fit Squad Global Ltd | Worthing | 2022 |
| Fit State Training Limited | Hove | 2011 |
| Fit Studio Limited | Sutton Coldfield | 2020 |
| Fit Studioz Limited | Basildon | 2019 |
| Fit Stunners Ltd | Woodford Green | 2024 |
| Fit Tennis Ltd | Corby | 2022 |
| Fit the Bill Limited | London | 2014 |
| Fit the Mould Ltd | Walton-On-Thames | 2023 |
| Fit Theory Ltd | Wetherby | 2025 |
| Fit Therapy Ltd | Croydon | 2026 |
| Fit to FLY Performance Ltd | London | 2026 |
| Fit to the Core Ltd | Reading | 2016 |
| Fit to Thrive Coaching Ltd | Leeds | 2021 |
| Fit Together Ltd | Buntingford | 2005 |
| Fit Training Ltd | London | 2024 |
| Fit Union Ltd | Oxford | 2020 |
| Fit Uxbridge Limited | London | 2024 |
| Fit Vitae Ltd | Crawley | 2019 |
| Fit With Coaching Ltd | Chorley | 2019 |
| Fit With Frank Limited | Weybridge | 2018 |
| Fit With ME Limited | London | 2021 |
| Fit With Purpose Limited | Cheam Sutton | 2012 |
| Fit With US Limited | Stony Stratford | 2019 |
| Fit With Viss Ltd | London | 2026 |
| Fit Women Group Ltd | London | 2005 |
| Fit XPO Events Ltd | Solihull | 2023 |
| Fit XPO UK Ltd | Solihull | 2019 |
| Fit Your Mind Studio Ltd | London | 2024 |
| FIT-2-FUNCTION Limited | Pomeroy | 2013 |
| FIT-4-SCHOOLS (UK) Ltd | Birmingham | 2014 |
| Fit-Af Limited | Sheffield | 2026 |
| Fit-Ness Highland Group Ltd | Inverness | 2017 |
| FIT24 (Central) Limited | Hull | 2020 |
| FIT24 (Seaham) Limited | Hull | 2018 |
| FIT24 (West) Ltd | Hull | 2019 |
| FIT2BOX Ltd | Cannock | 2015 |
| FIT2FITE Limited | Bishop'S Stortford | 2007 |
| FIT2FITT Ltd | London | 2018 |
| FIT2FLEX Ltd | Whitstable | 2017 |
| FIT2GETHER Limited | Bridgnorth | 2003 |
| FIT2LIVE Global Sports Ltd | London | 2025 |
| FIT2THE Core Training Systems Ltd | Consett | 2016 |
| FIT365 Health & Wellness Ltd | Coventry | 2020 |
| FIT3SIXTY Ltd | Worcester | 2015 |