Strengthening your core can improve your overall fitness abilities (like make you a more powerful runner or skier), can prevent injury or back pain, and improves your posture. Whether you throw in an ...

This exercise only targets the abdominal muscles, so it’s not a functional core workout. Crunches can be hard on your back and neck, and may not be safe for everyone. Share on Pinterest The crunch is ...

Perform this workout once a day for one week and see how you feel! If you're not sure how to do each movement, see the descriptions ahead. Lie flat on your back. Extend your arms so they're against ...