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Defense:Lifting heavy weight is what separates the men from the boys and allows bodybuilders to make the biggest gains in mass. In fact, some of the largest bodybuilders to ever grace the posing dais were ex-powerlifters.
Light weight wins for its ability to stimulate muscle protein synthesis and prevent injuries.
The real bottom line is that the majority of your workouts should utilize light-to-moderate weight for moderate-to-high reps. However, you need to frequently change your weight and rep ranges to keep the muscles stimulated and build both strength and muscle mass. So alternate between reps as low as 3–7 and as high as 25–50, but with the majority of workouts in the 8–15 range for best results.