Lengthening your hamstrings and outer hip muscles is easy if you know the right stretch. All you need is a doorway and a little bit of effort and you'll be on your way to stronger, more flexible legs and hips in no time!
Lie on your back. Both of your legs should be straight, with your arms spread out to your sides and your head facing upwards.
Take your outer leg and lift it into the air. Cross it over your other leg. Make sure your leg remains straight as you do this, or else the stretch won't be as effective.