Iron Crosses (stretch)

How to do it

1. 01Lie face down on the floor, with your arms extended out to your side, palms pressed to the floor. This will be your starting position.
2. 02To begin, flex one knee and bring that leg across the back of your body, attempting to touch it to the ground near the opposite hand.
3. 03Promptly return the leg to the starting postion, and quickly repeat with the other leg. Continue alternating for 10-20 repetitions.

Alternatives & substitutions

Same movement pattern, same primary muscles — swap by what you have.