| Abbreviation | Definition |
|---|---|
| HITT | High Intensity Tactical Training |
| HTF | Hi Town Fitness |
| HVF | Hudson Valley Fitness |
| IAFT | Indian Academy of Fitness Training |
| IBFF | Intercontinental Bodybuilding Fitness Federation |
| IBFF | International Bodybuilding Fitness Federation |
| ICOF | International Certificate of Fitness |
| IFI | Inclusive Fitness Initiative |
| IFI | International Fitness Interest |
| IFO | International Fitness Observatory |
| IFTA | Interactive Fitness Trainers of America |
| INBF | International Natural Bodybuilding Fitness |
| INFS | Institute of Nutrition and Fitness Sciences |
| JNFA | Japan Nordic Fitness Association |
| JRF | Josef Rakich Fitness |
| JSFC | Junior Summer Fitness Challenge |
| KBF | Katie Barnes Fitness |
| KPF | Knights Personal Fitness |
| KPHF | Kangaroo Point Health and Fitness |
| KTF | Kareem Team Fitness |