| PROGRAM | 1999 1998 1997 1996 |
| Personal Training | 87% 80% 82% 66% |
| Group Strength Training | 77% 80% 75% 63% |
| Stretching/Flexibility | 73% 72% 79% 69% |
| Step Aerobics | 71% 82% 86% 77% |
| Abdominal Classes | 71% 73% 76% n/a |
| Circuit Training | 70% 70% 75% 58% |
| Boxing-Based Classes | 69% 44% 34% 24% |
| Low-Impact Classes | 66% 77% 85% 80% |
| Interval Training | 64% 73% 75% n/a |
| Yoga | 64% 53% 54% 31% |
source: IDEA Fitness Programs Survey