Start in plank position; bodyweight in forearms and toes.
Reach forward at shoulder height with left arm, while simultaneously lifting right leg so that itâ€™s parallel to the floor; hold for 10 seconds.
Return to plank and repeat the motion, this time reaching with your right arm and raising your left leg simultaneously. Hold for 10 seconds and return to starting position. Completing an extension on each side of the body is one set
Looking for a way to tone abs, glutes, and chest at the same time? If you are looking for true total body toning, add this difficult move to your workout routine; you will see and feel the difference in your ab muscles, overall core strength, glutes, chest, and shoulders. This more advanced version is much harder than it looks and requires significant core strength and balance.