Most people only train half their bicep...
The bicep has two heads — and a standard curl only hits one of them well.
The fix: supinated curl on the way up, hammer grip on the way down.
Supinated (palm up) hits the peak. Hammer (palm in) loads the long head and brachialis — the muscle that makes your arm look thick and full from every angle.
Two grips. One movement. Complete bicep development.
Try it this week and let me know what you feel. (adding in some tempo movement as well!)