Surface | Muscles studied during biceps curl exercise | |||
---|---|---|---|---|
 | Rectus Abdominis | External Oblique | Internal Oblique | Erector Spinae |
Ball | 5.0 (5.8) | 3.0 (4.4) | 9.0 (8.4) | 8.7 (7.4) |
Bench | 4.2 (5.7) | 2.2 (1.9) | 6.9 (6.0) | 6.5 (6.3) |
Difference | .83 (2.65) | .74 (2.86) | 2.14 (5.79) | 2.23 (4.67) |
Increase | 1 | 1 | 1 | 3 |
Decrease | 0 | 0 | 0 | 0 |