It is usually recommended when doing the Abdominal Crunch to not anchor your feet under anything as it activates the hip flexors.
While this is very true, here is a variation where you DO need to anchor your feet under something.
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Build muscle and strength like clockwork, even with very limited equipment, or NO equipment at all. This unconventional approach even builds muscle with light weight, saving your joints and nervous system from overload while you build mass fast.