Hai Thaitang,

My opinion about your problem

If the pain is dull aching just referring down to your wrist from your elbow it would be because of fascial pain from the biceps if the pain is in front of the forearm

Before doing all those resisted exercise please do stretching for biceps and hold it for 15-20 sec and repeat it for 5 times

I think this would really help you out

Bye