Are you looking for a new and innovative approach to a regular knee tuck? Then, you have landed on a right place. DynaPro Direct and Crush Fit have teamed up to bring you a 30 day knee tuck challenge with an exercise ball. This challenge will help you target the entire abdominal region, including the upper, lower, and oblique portions of the core. Take up this 30 day challenge and reach your fitness goals in a short period of time.