Hip Flexor Flexibility Test

Here's a test you may perform to test hip flexor flexibility. 

Lie supine. Clasp hands behind your right knee and pull it in to the chest as far as possible. Keeping low back pressed to floor, extend the left leg and attempt to press back of left knee to the floor. Adequate flexibility exist if the back of the knee and the low back can both be pressed to the floor simultaneously. Check both sides.