Very often there can be tightness in the front of your thigh and hip flexors (the quads / quadriceps muscles) which can cause your pelvis to tilt forwards as they are pulling on the front of it down towards your knees.
- Make sure you are standing up completely straight and do not allow your pelvis or hips to twist or lean forwards
- Bring your leg behind you and grab the heel
- Pull the foot towards the buttock and see if you can get your heel to contact the buttock
- Check the other side for symmetry
If you cannot touch heel to bum without twisting, or you there is an uneven stretch, then either do the above as a stretch or speak to your Chiropractor for specific advice!