How Big Of An Exercise Ball Do I Need?
How Big Of An Exercise Ball Do I Need? If you’re between 5’1′′ (155 centimeters) and 5’7′′ (170 centimeters), a 55-centimeter ball is a good choice. If you’re between 5’8′′ (173 centimeters) and 6’1′′ (185 centimeters), try a 65-centimeter ball. If you’re 6’2′′ (188 centimeters) or taller, try a 75-centimeter ball. Air pressure counts, too.