The GoFit Professional Grade Stability Ball is a round, unstable surface, so you not only train the primary muscle groups but also the smaller stabilizing muscles as well.
PRINTED EXERCISE: The Professional Grade Stability Ball has exercises printed directly onto the ball, making this stability ball a fun, yet challenging way to stretch, tone, and tighten your body!
SIZES: The 55cm (blue) Professional Grade Stability Ball is recommended for persons 5’ to 5’5”, the 65cm (red) ball for persons 5’5” to 6’, and the 75cm (silver) ball for persons 6’ and over.