This is typically caused by tight hip flexor muscles and with proper stretching you can bring balance back your body. (liftingrevolution.com)
The group of hip flexor muscles will be demystified as we take a look at what muscles actually move the leg away from and in toward the body. (gatheryoga.com)
Take 5 - 10 breaths here to open up the hip flexor of the back thigh. (health.com)