Try these bed exercises for seniors, rebuild leg strength after 60 in 15 minutes. Why Bed Exercises WorkYour bed provides something gym machines can’t: a familiar, safe environment where you can focus entirely on the movement without fear of falling or looking foolish. Bed exercises work because they remove every excuse. Bed exercises also let you work through a full range of motion safely. Keeping your leg straight and your quad tight, lift your right leg until your thigh is level with your left thigh.