We spend so much time working our legs doing squats and running, strength training for our arms, and crunches for our abs, so don't forget about your back. Strengthening this part of your body is excellent for your posture, keeps your spine healthy, and will help prevent injuries due to imbalances in your muscles. Prone Leg Raises are an awesome exercise, but this one will work your upper back as well and truly challenge your core.

If you want to know how to do this move read more

• Lay your belly on a ball. Stabilize yourself by placing your hands underneath your shoulders, and your feet hip distance apart.
• Simultaneously lift your right arm and your left leg straight out. Hold for two seconds and then release back to the ground. Now lift your left arm and your right leg. Hold for two seconds and slowly release. Try to move slowly and with control. Try to keep the ball as steady as possible. Use your deep abs to help stabilize.
• Repeat this move for a total of 15 to 20 reps on each side.

Do you work your core? You should do moves like this at least two times a week. Add this one to your strength training routine and your back will love you for it.