Plank with Diagonal Arm Lift
Assume a modified pushup position with your feet shoulder-width apart, forearms on the floor. Keeping your torso steady, raise your right arm for-ward and to the right, so that it points to 2 o’clock. Hold for 2 seconds, then lower and repeat with your left arm, raising it to 10 o’clock. That’s one rep. Your elbows should be bent 90 degrees and directly under your shoulders.
Lie on your side with your forearm on the floor under your shoulder to prop you up, and your feet stacked. Contract your core and press your forearm against the floor to raise your hips until your body is straight from ankles to shoulders. Hold for 15 to 45 seconds, then repeat on the other side. Contract your abs and butt muscles forcefully to keep your body straight.
Lie on your back with your legs extended straight up. Keeping your legs straight, lower your left leg until your foot is 2 to 3 inches off the floor. Return to the starting position, then repeat with your right leg; that’s one repetition. Think about pushing the bottom of your heel away from your hip as you lower your leg. Don’t point your toes; keep your foot flexed toward you. Lead with your heel.