Surface | Muscles studied during shoulder press exercise | |||
---|---|---|---|---|
 | Rectus Abdominis | External Oblique | Internal Oblique | Erector Spinae |
Ball | 6.01 (6.29) | 4.1 (5.4) | 21.7 (31.5) | 3.7 (3.3) |
Bench | 6.9 (9.6) | 3.5 (3.6) | 15.2 (15.2) | 13.4 (30.3) |
Difference | -.98 (4.29) | .6 (2.59) | 6.52 (30.23) | -1.07 (4.62 |
Increase | 0 | 1 | 1 | 0 |
Decrease | 1 | 0 | 3 | 1 |