Both the minimal relative activity of the rectus abdominis and the high internal
oblique to the rectus abdominis activity ratio reported in the present study are in accordance with
results of other trunk stabilization exercises. The relative muscle activity and the ratio of the
abdominal obliques seem to alter depending on the task and the presumable need for stability. The
findings concerning the relative muscle activity and the ratios of the back muscles support the
assumption that during these bridging exercises, all back muscles contribute in a similar way to
control spine positions and movements in a healthy population