The 75 cm TRNR Gym Ball is a must-have training tool, delivering greater core strength, balance, coordination, range of motion, joint stability, and postural alignment. By adding instability to your workouts, your...
The 65 cm TRNR Gym Ball is a must-have training tool, delivering greater core strength, balance, coordination, range of motion, joint stability, and postural alignment. By adding instability to your workouts, your...
The 55 cm TRNR Gym Ball is a must-have training tool, delivering greater core strength, balance, coordination, range of motion, joint stability, and postural alignment. By adding instability to your workouts, your deep...