ANSWERS: 2
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I wouldn't advise it as this paves the way to injury and muscular imbalance. We all have a slight discrepancy of strength between our arms, since we use one more than the other in day to day life. When you perform exercises that use both at the same time, for example a bench press, you will find one side pushes more than the other. To get around this, perform unilateral exercises, exercising one side at a time, and work both equally. So if you do bicep curls, do your left side only for e.g. 10 reps and then yor right side only for 10 reps. At first you will of course find it easier one side then the other but overtime as the same stress is put onto both sides, the lesser side will grow and catch up as a result.
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No, you shouldn't work out one arm more than the other. Barbell curls are a good exercise to start your arm routine with. It forces both arms to work simultaneously. If your left arm starts to fail before your right one, then rack the weight and rest until your next set. If you do this, you have worked your left arm more than your right because its capacity was lower and you brought it to failure. Your right arm probably could have gone another rep or two (maybe more) but by completing the set before this happens, you are ensuring over time that your muscles will even out. Another example is alternate curls. Again you would use your left arm as the limiting factor. When you couldn't get another rep with your left arm, re-rack the weights and rest. This puts emphasis on the left arm muscles and can be extrapolated to your triceps, pectorals, etc. Commit to a workout program and I guarentee your strength differential will even out in time
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