Unlike standard curls, concentration curls allow you to focus on contracting your biceps muscle without using body momentum, helping to maximize tension placed on the muscle. ... This results in greater activation of the biceps, which is what helps build more strength.

Should bicep curls be heavy?

You want to keep tension on the muscle throughout each rep, so don't curl the weight up until your forearm touches your biceps, but make sure you do lower the weight all the way back to the start.”

What is considered a heavy curl?

According to Weis, men up to 120 pounds should be able to curl 70 pounds; men 121 to 135 pounds should be able to lift 85 pounds; men 136 to 155 pounds should ideally lift 105; men 156 to 170 pounds should lift 120 pounds; men 171 to 185 pounds should lift 135 pounds; men 186 to 205 pounds should lift 155; men 206 to ...