When doing a dead bug abdominal exercise with a stability ball, do you keep your lower back neutral or flat on the mat?
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I am of the school that believes in strengthening as much as possible in a neutral spine. Newcomers to this exercise, though, will find a posterior tilt much easier than a neutral spine. I would use it as a learning tool for a neutral pelvis and how to maintain it.
The only thing to avoid is an anterior pelvic tilt.
Hope this helps.
Karin Singleton
www.meltnc.com