Not very: Read a few good articles on exercises that involve raising the legs while exercising the abs. Situps target mostly the upper abs. A few resistance variants, mostly involving pulling cables with the feet, are best done by people who are really good at using machines. Protect your lower back when you're doing all of these.
Answered 4/25/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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