ARR, get pavel tsatsouline's books if possible. They're chocked full of good information and easy to read.
Some information i gained from him is that tone = residual tension. After intense contractions, your body learns to contract the muscles automatically somewhat, sort of like standby mode, giving you the toned look. So one thing would be that your training ought to be intense!
Another piece of information (this one is a lot more common) is that muscle mass is obtained with 6-12 reps but your intensity must be such that anything above 12 would lead to failure or something.
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