His posture is completely wrong in 0:41. You must to suport all your back in the chair. This way you ll probly gain a seriuos problem at L4-L5. Take care of your back always !!
rveras2009 1 year ago
His posture is completely wrong in 0:41. You must to suport all your back in the chair. This way you ll probly gain a seriuos problem at L4-L5. Take care of your back always !!
rveras2009 1 year ago