If you want to build your biceps, you must improve your ability to recruit and contract them.
When it comes to biceps, focusing on getting them strong often makes it more difficult to get them big. Going heavy can shift the tension away from the biceps. Practicing intense contraction of the target muscle is much harder to do when using heavy weights.
So when you're trying to fix lagging biceps, the first thing to do is work on constant tension to maximize the mind-muscle connection. The time spent doing it will be an investment in all the future biceps training you'll do.
Do every rep of your bicep work like this:
Remember, frequency of practice is the key to motor learning. Once you've spent some time training the biceps like this, you'll be able to switch to heavy lifting, but now the tension won't shift away from the biceps because you improved your capacity to recruit the muscle and keep it tensed.
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