Sounds easy right?
Do a couple sets of these and tell me what you think after ;)
"Sit with knees bent and tucked into chest, arms wrapped around shins, head down, heels raised, toes touching mat. Lift toes and balance on tailbone, heels close to butt (as shown). Inhale as you roll back slowly until shoulder blades touch mat. Exhale and use abs, not momentum, to roll up and balance on tailbone again, keeping toes from touching mat. Do 10 times."