I was training biceps today and after to isolated movements I went to do hammer curls which which I can usually work up to like 70lb DB and I couldn't even hit the 40lb DB. Should I call it quits for the day and figure my biceps just got a great pump already? Or should I drop the weight and burn it out and finish my usual routine for that day? My arms where pumped about to tear the skin but I felt I would be depriving them compared to normal. So my question is should I have called it good or lowered weight and continued to train?