Medi-Dyne's CoreStretch is designed to elongate the back, stretching the muscles, tendons and ligaments not only in the back but also in the legs, including hips, hamstrings and shins, which work in conjunction with the back. Traditional and conventional back stretching methods are either too difficult to use or force the back to curve instead of elongate. CoreStretch is also light and collapsible making it easy to transport.