Mountain Climbers

Start in a high plank position with your hands under your shoulders and your legs extended behind you, balancing on your toes. Keep your core engaged.

• Bring one knee in toward your chest as far as you can. Keep your hips down and don't let them rise or sag as you bring the knee in.

• Extend that leg back to the starting position as you immediately bring the other knee in toward your chest in a quick alternating motion.

• Go as quickly as you can while maintaining control. Your movements should be fluid, not jerky.

• Keep your hips square and do not rotate them from side to side. Maintain a straight line from your head to your heels.

• Engage your core to keep your hips from sagging. Do not arch your back.

• Maintain your balance and control. Avoid letting your hips rock side to side.

• Breathe steadily as you perform the exercise. Do not hold your breath.

• Start slow and with limited range of motion if needed, then work up to a quicker pace and fuller range of motion. Use your core strength to stabilize your body position.