Half Kneeling Quad and Hip Flexor Stretch

I like this because keeps tension without having to work it. Make sure that you fire (shorten) the glutes and move your body forward, lengthening out everything on the front side. I also like to add a reach in to get just a little more out of the stretch.

One thing to look out for is reaching with your back and having too much of a curve in your lumbar spine.