There is a trainer at my local gym that said he came up with the perfect rep scheme. He said your first 2 sets 4-6 reps, the next 2 sets 12-15 reps, the next 2 sets 20-25 reps. He said your muscles are made of 3 types of tissues and this rep scheme will hit each tissue. Please feel free to give positives, negatives or you own opinion on this rep scheme.