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Table 2 Bench Press Exercise muscle activation levels (% MVC, standard deviation in brackets), average difference between surfaces and number of participants whose change in activity was greater than 5% MVC.

From: Replacing a Swiss ball for an exercise bench causes variable changes in trunk muscle activity during upper limb strength exercises

Surface Muscles studied during bench press exercise
  Rectus Abdominis External Oblique Internal Oblique Erector Spinae
Ball 7.4 (6.3) 5.7 (6.8) 13.5 (9.2) 6.06 (5.9)
Bench 4.7 (6.2) 3.1 (2.8) 8.2 (6.8) 3.1 (1.6)
Difference 2.68 (6.49) 2.52 (4.7) 5.2 (6.26) 2.93 (5.9)
Increase 4 3 4 3
Decrease 2 0 0 0