Lot 's of things can cause this , but what happens is you lose your spine angle as it gets more upright , your arms get stuck behind you , and do n't have the room to swing left .
Your body is now in the way .
Lot 's of things can cause this , but what happens is you lose your spine angle as it gets more upright , your arms get stuck behind you , and do n't have the room to swing left because your body is now in the way .