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While doing the leg lift exercise, why should my lower back not leave the ground?

by admin on November 24, 2009

I’ve seen many similar instructions for doing leg lifts while flat on your back, esp Pilates double straight leg stretch. But all say to engage the core, lower legs only to 45 degrees, and to not allow the lower back to lift off the ground. Why? Will this disengage a muscle or cause strain? Looking for answer that includes which muscles are affected when back lifts. Thanks!
If my lower back lifts up, exactly which muscle becomes disengaged? Where can I find a diagram?

Lifting the lower back could cause strain, and also it keeps you from isolating the abdominal muscles.

Leg Stretches

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