If you are comfortable in a prone position (that is on your belly) you may try this quad stretch. Be mindful of your low back as many people arch their back to accomplish the perceived movement. Also be mindful of your shoulders and do not attempt if raising your arm above your shoulder is generally painful. Hold for 30 seconds if under age 60 and 1 min if over age 60; Repeat 3 times each leg and perform 3 to 4 times a day