Its been covered... but my two cents garnered from my exhaustive experience (Arnold's book and 10 weeks of working out ) is:
Do more variety of exercises, mix it up with concentration curls, incline curls, preacher curls, cheat curls (use your back with more weight), reverse curls, etc.
Do more sets, with less weight since 6 reps isn't getting growth (common wisdom is 8-12 reps per set is best for growth). Do 12-15 sets at least since its a problem area.
Train biceps first on the days you train them.
Make bicep curls your last Bicep exercise and then "work the rack", and triset them, like 55s->45s->35s or whatever with no rest in between.
Do more variety of exercises, mix it up with concentration curls, incline curls, preacher curls, cheat curls (use your back with more weight), reverse curls, etc.
Do more sets, with less weight since 6 reps isn't getting growth (common wisdom is 8-12 reps per set is best for growth). Do 12-15 sets at least since its a problem area.
Train biceps first on the days you train them.
Make bicep curls your last Bicep exercise and then "work the rack", and triset them, like 55s->45s->35s or whatever with no rest in between.
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