| Abbreviation | Definition |
|---|---|
| FCK | Fitness Connection Kingdom |
| FCMS | Fitness Club Management Software |
| FDFE | Fuzzy Deduced Fitness Evaluator |
| FEI | Fitness Events Incorporated |
| FEP | Fitness Enhancement Program |
| FFAT | Functional Fitness Assessment Test |
| FFC | Financial Fitness Coach |
| FFD | Fitness for Duty |
| FFD | Functional Fitness Dundee |
| FFEM | Female Fitness Education and Motivation |
| FFFF | Friday Food Fitness and Favorites |
| FFFL | Financial Fitness For Life |
| FFFP | Functional Fitness for Falls Prevention |
| FFG | Functional Fitness Group |
| FFGA | Financial Fitness Greater Austin |
| FFHH | Fitness For Human Habitation |
| FFI | Force Fitness Instructor |
| FFKC | Fight Fitness Karate Club |
| FFKC | Fitness for Kids Challenge |
| FFN | Faith Fitness Nutrition |