Rocking While Curling
Rocking is for chairs, not for the gym. There’s a time and place where cheating is acceptable, but for the most part, assume that you should not be using a rocking motion to help you lift weight. The added momentum doesn’t do anything for the workout, and only makes it easier for you to complete the exercise. Rocking is one of the first signs of cheating repetitions. There’s also the risk of engaging other muscles that aren’t your biceps. For example, the shoulders. The bottom line is if the weights and reps are becoming too difficult where you need to rock back and forth to get that extra rep – trying lowering the weight a bit.