Ive noticed recentky that i my muscles get pretty fatiqued after some few sets of working out. For example since i train with high intensity and a 5x5 programm i do all my sets to failure.
So lets say i do weighted pullups. Ive noticed after my second set to failure my back is like stuck on. Im full pumped but my reps are gradually decreasing where by my last set i can barely do 2 . Like my back is stuck and wont move. Anyone knows why this happens and what to do to avoid it?