Powerhouse CoreJanuary 15, 2015 at 4–5 p.m.

Make abs of steel a reality as you strengthen both abdominal and back muscles using a stability ball. Your core will be worked to the max with integration with nothing but your own body weight and a large spherical object.

• Jan 8, 2015 at 4–5 p.m.
• Jan 22, 2015 at 4–5 p.m.
• Jan 29, 2015 at 4–5 p.m.