I compare metabolism to a lamp wick. If your metabolic rate is low, it is like a lamp wick that's turned down. It gives off a feeble flickering flame and it smokes because it is not burning properly (lack of oxygen). So it is with your metablic rate. If it is too low, you do not burn food properly, so you store it as fat. If your metabolic rate is high, the food you eat is burned as energy instead of being stored as fat!
The body builder with his limited references would attempt to solve this problem by including hundred of sit-ups and leg raises to his program. Also he would employ high reps on every body part, with little or no thought of diet and supplements. I have discovered that high reps and daily working the abdominals produce a smooth bloated look - due to excessive hormone loss.