Abstract: A portable, adjustable apparatus for stretching the muscles of the lower body, in particular, the hip flexor and thigh muscles, comprised of a back support, a flexible line, a knee cradle attached to the mid-portion of the flexible line, and a line tensioning device which receives the free end of the line. The line-tensioning device allows a user to perform flexed-knee stretches such as the knee-to-chest stretch without having to manually hold the knee in the stretched position. The position of the back support and line-tensioning device relative to the knee cradle allows the knee to be drawn directly back towards the chest to optimally stretch the hip flexor and thigh muscles.