Too many variables to answer, in one case u can pin point the cause it could be something is stiff or something is weak making other muscle compensate. I would advice a rigorous work out like this just yet, yoga would be great firet
She's not the only 1 standing there so y didn't u mention anyone else out of all of the other people that's not participating??? What r u trying to say...? Don't do that. Take your negativity on somewhere else. It's messed up people like you that needs to be shut up and shut down... Y AREN'T U DOING IT...???
