Hello Doctor,I Have A Problem In My Right Hand For

Hello doctor,I have a problem in my right hand for a year now(maybe it was caused by too many pull ups and weights without warming up).When I type in the keyboard or try to play the piano,my forearm and wrist gets really easily tired.It feels like I have been lifting weights and like being tight.It is also a bit stiff and heavy.There is no pain at all and as the EMG showed,no carpal tunnel.What could the problem be?Thanks for your time