This is similar to the Pilates Rollup, using the abdominals to pull your body up to sitting, one vertabra at a time, Pelvic floor, inner thighs, and abdominals are very much involved. Lying on a bench, thus elevated, is a modification for beginners. Exhale as you roll up, as well as roll down. Find out more at www.susannaengfitness.com/