Whatever you like; recommend picking one style and sticking with it so you can compare performance over time. Lots of folks like the ab-mat. Arms extended behind head, feet anchored, knees open�. All the way back until base of shoulder-blades hit the floor; up to near vertical. The best choice is to ask your coach for that class!
5828 Ashleyanne Circle #100
Wichita Falls, TX 76310