Bottoms Up is a killer ab exercise for your core. Especially for your lower abdominal region. It requires no equipment and can be easily done at your home.
This exercise is great to continue developing your abs if regular crunches have become too easy. This exercise is more challenging and tougher because of added resistance and muscles being under tension for longer period of time as well.
When extending your legs in the air, don’t go beyond your eye level with your toes.
Make sure your lower back is flat against the floor and it’s not arched at all times.
Don’t use the assistance from your hands to lift yourself up.