I'm doing curls, but my forearm hurts instead of my biceps?

Question

I am doing your regular curls with correct form. After my 10 or so reps my forearm is in pain and as tight as a knot. I compare it with my right forarm and its much much much tighter.

As a result my grip is getting looser it and now my wrist is begining to hurt. The most agrevating part is that my bicep isn't even getting a work out. I feel very little burn and im not sure if much is being done to it.

I have broken this arm as a child, so could that be a factor?

Could this be that I STILL have bad form?

Does it have to do with physiological built up of my arm?

What workout can I replace this with so that my forearm isn't getting worked out, but instead my bicep, the target muscle.

Answer 1

That just means your forearms are weak. The forearms have to work isometrically, so you should try to strengthen them.