More Bang For Your Buck
There are many ladies out there who fear they will bulk up if they lift heavy weights and many trainers who perpetuate the myth. There is another reason, aside from saving time, for lifting closer to your maximum weight load instead of doing 100 reps with a super light weight: increase calorie burn for two hours after training. Lifting a greater weight fewer times means you can burn almost twice as many calories post workout. Think of it as more bang for your buck.