Dmitri Lang
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The exercise was weighted Stability Ball Crunches – but there were not normal crunches on the ball that you see people do. You see, not only did the client do a full-on sit-up motion, but she kept going – violently – into a total body flexion movement that ended with her almost putting her head between her knees. But doing any type of spinal flexion can be harmful to your low back because this will... FULL ARTICLE @ http://tillfit.com/10-abdominal-exercise-substitutions/

The exercise was weighted Stability Ball Crunches – but there were not normal crunches on the ball that you see people do. You see, not only did the client do a full-on sit-up motion, but she kept going – violently – into a total body flexion movement that ended with her almost putting her head between her knees. But doing any type of spinal flexion can be harmful to your low back because this will... FULL ARTICLE @ http://tillfit.com/10-abdominal-exercise-substitutions/