Is it wrong to stretch the quadriceps by holding on to your foot with the opposite hand. I find this to be an effective stretch and easier on my knees and often teach my clients to use this method if they have difficulty taking hold of their foot. However one of my colleagues feels that this is wrong and that the only correct way to stretch the quads is to hold the foot with hand of the same side. Your opinion please.
When you hold the thigh with the opposite hand you probably externally rotate the thigh and that is why you may feel a different, or deeper stretch. This is not problematic on the knee unless there are other issues. Always stretch in pain free ranges. Also, if you feel a deeper stretch while the thigh is externally rotated, it may be because you may feel the iliopsoas stretching as well. As far as being "wrong", the muscles of the body do not work in straight lines, so stretching with some rotation is not a bad thing. Remember to get the most effective stretch for the quads, you need to stretch at the hip as well, pulling the thigh back to stretch the rectus femoris at the hip as well as the knee. You may also feel less stress on the knee when you deliberately try to stretch at the hip as well.