You must manipulate resistance to build muscle! It’s not just about reinventing the wheel and getting all “fancy shmancy!” andrewvanorder #dingding | #curlsforthegirls #personaltrainer |#personaltraining |#legcurls |#strengthtraining |#hamstrings |#fitness |#bodybuilding |#athletes |#performance |#gym |#gymtime |#legworkout |#mymacgym |#orangegym |#mactough