Hey,
Sorry to hear about your issues! When you say ”gives way”, is that because of weakness or pain? How many reps are you doing with a 6kg dumbell for it to give way? Also, when you say it’s getting tight and becoming strained, are we talking the ”whole” bicep or more of the insertion up at the shoulder?
/Eric
Sjukgymnastik, personlig träning, massage & akupunktur i Karlskoga