The scary thing is that because of the vast popularity Joint Pain Hack Review of this exercises, it's very likely that you're practicing it or that it has been recommended to you by a chiropractor, physical therapist, yoga instructor or personal trainer.
As I have done in my previous stretching donts article, I'm going to provide you with a whole bunch of science and a solid rationale for why the stretching exercise listed below both fails to promote proper movement patterns, and, based on recent research, may actually lead to dysfunction.
The Lying Piriformis Stretch and/or Standing Leg Cradle The leg cradle is used by many sports coaches to develop mobility in the hip rotators by mainly stretching the piriformis. It's basically a standing variation of the traditional supine piriformis stretch. This is another one of those movements that I haven't used much because I've never really liked it. I feel that it's a hard movement to coach and thought that it created unnecessary torque on the knee joint. Regardless, I kept giving the leg cradle a chance and used it on occasion.
Finally, however, I decided to eliminate it entirely from our program while attending a physical therapy workshop. It was called Diagnosis of Mechanical Dysfunction and Stability Retraining of the Hip, and taught by Mark Comerford. During the workshop, Comerford thoroughly explained why stretching the piriformis from any position (standing, sitting, supine, etc.) with the hip externally rotated and abducted (as in the leg cradle) will actually do more to stretch the posterior lateral hip capsule than the piriformis muscle. According to Comerford, consistently stretching the hip capsule in most cases is a bad thing because it can develop uncontrolled motion (i.e. instability). This type of instability can eventually lead to a number of hip dysfunctions such as hip impingement syndrome.