Why hit the gym when you can transform your home into a custom ab class?
Start lying on your back with your arms reaching toward the ceiling.
Exhale and roll up toward sitting while lifting your left leg up. Pause at the top and reach for your toes before rolling down slowly back to the mat. This completes one rep.
Repeat, lifting the right leg as you roll up toward sitting.
Continue alternating sides for a total of 20 reps.