| Abbreviation | Definition |
|---|---|
| FMFC | Functional Movement and Fitness Center |
| FMFC | Functional Movement Fitness Center |
| FNFDA | Fédération Nationale de Fitness et de Disciplines Associées (French: National Federation of Fitness and Associated Disciplines) |
| FNM | Fitness n Motion |
| FNS | Fitness Never Sleeps |
| FNS | Fitness Nutrition Specialist |
| FNS | Fitness Nutrition Specialization |
| FNSO | Fitness N Side Out |
| FOFA | Financial and Operational Fitness Audit |
| FOFA | Financial and Operational Fitness Audits |
| FOW | Fitness On Water |
| FPN | Fitness Proportionate Niching |
| FPTC | Fitness and Physique Team Competitions |
| FQ | Fitness Quotient |
| FRNF | Fitness Results North Fremantle |
| FSQ | Fitness Screening Questionnaire |
| FSSA | Fitness and Sports Sciences Association |
| FTF | Fight To Fitness |
| FTPC | Fitness to Practise Committee |
| FUN | Fitness and Understanding Nutrition |