3. Leg Raises

If you have a dominated bar, plunge station, or vertical knee lift station, you can work your abs with knee or leg lifts. You can also practice other types of leg lifts by knocking yourself on the floor on your back and with something sturdy to support you. Grab the stand above your head, then lift your legs in the air and lower them, keeping your abs tight.

These multipurpose exercises target several muscles at once, including the arms, shoulders, and, yes, back muscles as well.

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