The Thera-Band® Standard Exercise Balls are inflatable balls used to strengthen muscles to improve posture and help prevent back pain.  Each exercise ball comes with two plugs and an inflation adapter, along with the Thera-Band® Exercise Ball Guide Poster detailing 24 exercises. Five sizes are provided to allow for user height variations.

5 different sizes for different heights:

Yellow, 45 cm for 4'7" to 5'

Red, 55 cm for 5'1" to 5'6"

Green, 65 cm for 5'7" to 6'1"

Blue, 75 cm for 6'2" to 6'8"

Silver 85 cm for 6'9" and taller