Double Cross Reach
The double cross reach will test your balance and coordination while working your abs, back, thighs, and hip flexors.
Lie on your back with legs straight and arms extended above your head. Keep your pelvis flat and a natural arch to your back.
In one fluid motion, simultaneously lift your torso and legs, reaching with your right hand across the body to touch the toes of your left foot. Do not allow the lower back to collapse.
Scissor the legs and switch arms so that your left hand touches the toes of your right foot. Keep your torso tall.
Slowly lower back to the starting position and repeat, this time beginning by touching the left hand to the toes of the right foot.
Caution
This advanced exercise can stress the lower back. If you have low back pain or injury, substitute the bicycle crunch instead.