The reason why my trapezius muscles hurt when I work out

pu1. I think it's because you put too much strength on your shoulders, but because you can't exercise well, your shoulders shrink

2017-12-12

OK

pu2. There's a good chance it's because I didn't straighten my back. You have to fix your waist in an electronic posture, but it's like you're working out in a posture where you bend your waist

2017-12-12

OK