| Abbreviation | Definition |
|---|---|
| MFTD | Medical Fitness To Drive |
| MFU | Mobile Fitness Unit |
| MFW | Misc Fitness Weights |
| MICKEYMIZED | Excellence in fitness, health, wellness and wellbeing!Get Energized, get maximized, get optimized, g |
| MIFE | Miami International Fitness Expo |
| MMFR | Method Mobility Fitness and Rehab |
| MNF | Monday Night Fitness |
| MPFPA | MINDEF Physical Fitness Performance Award |
| MSFT | Multi Stage Fitness Test |
| MSFT | Multi-Stage Fitness Test |
| MVF | Minimum Viable Fitness |
| NBFE | National Board for Fitness Examiner |
| NCFF | New Castle Family Fitness |
| NFC | National Fitness Campaign |
| NFCB | Nordic Fitness Center Brussels |
| NFLA | National Fitness Leaders Alliance |
| NFLA | National Fitness Leadership Alliance |
| NFNA | National Fitness and Nutrition Academy |
| NFPH | Nutrition Fitness In Pursuit of Happiness |
| NIFS | National Institute for Fitness and Sport |