With biceps, much of the work should include a very forceful squeeze at the end of each rep. The hard flex will drive blood into the muscle.
The incline concentration curl is great for hard contractions. Just push the dumbbells together and squeeze the heck out of them.
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Use this set-extending technique to fit more soul-crushing work into fewer reps and less time.
Life has this annoying habit of interfering, but that doesn't mean training should get put on the back burner.