I have a noticable difference in the strength of right arm and left arm(left arm being stronger). I'm doing regular gym from the past one month and i follow a card of exercises and weight training prepared by my trainer but while training biceps and arms, i face issue to do biceps related exercises with my right arm. For example while doing alternate dumbell curl i'm able to do 3 sets of 12 reps with a weight of 5-7 kg with my left arm but with the right arm i can't do more than 3kg. While doing the right arm biceps with even 5kg i face lifting issues and have to switch to 3kg for that right hand. Is this due to some ligament problem in my shoulder? I have never had any previous injuries in my right arm or shoulder ligament. Kindly help me out here and guide me how to rectify this problem Thanks