How to Choose Exercise Balls By: Kendra Ryckman Updated on: April 05, 2017 More Articles Six-Pack Abs With an Exercise Ball Workouts: Squats With a Barbell Hamstring Stretches & Strengthening How to Find Someone's E-mail Address How to Refill Transmission Fluid Related About the Author Kendra Ryckman is a Pilates instructor at Simply Pilates, a successful Pilates studio located in Nashville, Tenn.