Abs curl

Instructions

1. 
   Sit with knees bent, feet flat on the floor, and with a mini stability ball between your inner thighs (for an added challenge, hold a light weight plate, arms straight, above your legs). Holding sides of thighs with each hand, roll down one vertebrae at a time until shoulder blades nearly touch the floor but are not flat on floor (and weight plate, if using, is straight above chest).
2. 
   Squeeze ball and curl chest up again. (If holding weight plate, press it back above shins as you rise).