gjohnson5 said:High rep work burns calories...
Yeah, true, but the amount of calories greater burned is insignificant, if any at all.
calories=energy.
Pushing more weight (less reps) requires more energy/calories to push. I know when I do heavier weight, my heart rate goes higher than when doing high rep.
tone comes from a clean diet and cardio, or a low BF%. Maximum hypertrophic lifting allows for greatest tone, because there is the greatest amount of muscle to be seen. Very high rep won't allow for maximum hypertrophy for a lot of muscle groups.