Avoid exercises that spend energy unproductively (select exercises that have maximum benefit, and skip exercises that don't produce much benefit for the energy invested). As one example, "Hanging Leg Raises" is one exercise that is very inefficient. It's considered an Ab Exercise, but the abdominal don't directly pull on the abs. So they're involvement is incidental. Most of the work is being done by other muscles, and only about 10% of the benefit is going to the abs.
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