I have been consistently working out for 5 days a week since the past month, using the same 5kg dumbbell (each side), my biceps still feel very weak after so long, and also my right hand is definitely stronger than my left hand, coz my right hand feels nothing after a workout, but my left hand feels super fatigue.
Any sifus here can suggest what should I do to make my arms feel stronger, and make my biceps bigger?