| muscle: | Lower Back, Rectus Abdominis, Obliques |
|---|---|
| auxiliary muscles: | Glutes, Trapezius, Hamstrings |
| required: | Nothing |
| optional: | Weight Cuffs, Fitness Mat |
| level: | Normal |
| type: | Strength, Plyometrics, Cardio |
Variations Of Jackknife On Exercise Ball, One-Legged
| muscle: | Deltoids, Rectus Abdominis |
|---|---|
| auxiliary muscles: | Obliques, Hamstrings, Glutes, Serratus Anterior, Latissimus Dorsi, Trapezius, Lower Back |
| required: | Exercise Ball |
| level: | Normal |
| type: | Strength |
| muscle: | Rectus Abdominis |
|---|---|
| auxiliary muscles: | Lower Back, Obliques, Quadriceps |
| required: | Exercise Ball |
| level: | Hard |
| type: | Strength |