A favorite core exercise that can be easily implemented is the plank. It is a simple exercise for kids to learn, you can add variations and progressions over time, and you can use time as a measure of improvement to give kids a performance goal. Start with a couple of sets -holding each for 30 seconds.

A plank is an easy ab workout to do at home. Just start in a push-up position, then bend your elbows and rest your forearms flat on the ground. Then, flex your stomach muscles and hold! For an easier version of this exercise, start from your knees. Make sure your back stays flat. You can do these for 20 seconds or until you get tired.

A plank is a safe and effective isometric abdominal exercise your child can perform. Have your child lie down on his stomach with his legs extended and arms at his sides. Have him bend his arms at the elbows, placing his forearms to the side of his shoulders.