Core & Glute Blasters: This is a really challenging move that strengthens the entire body, especially the core, arms, abs and butt. Support yourself on your side, hips and shoulders in the same plane. Balance a fitness ball against the wall and roll it up and down, flexing your glutei (booty) and core. 10 reps each side.
Abs & Thighs: Hold a fitness ball between your legs, ankles over the hips. Contracting your abs, rotate the ball 10 times both ways and then with a slight bend in your knees, lower and raise your legs 10 times.