stretchmax - leg stretching for ballet, dance & gymnastics training stretchmax stretchmax is a portable and light weight stretching system designed for dancers and gymnasts to improve their leg flexibility and range of motion. users can safely stretch their hamstrings, calves, quadriceps and hip flexors. at about 5 ounces, it's so small and light weight it can easily fit in the pocket of a dance bag or gym bag and go anywhere with you. instructional videos available.