One common question when it comes to workout routines is how many reps and sets should be performed per exercise. Let's start from the beginning. You always want to balance the amount of weight and number of reps so that your muscles struggling on the last rep of the set. Different rep ranges stimulate different types of muscle. everyones body is made up of 2 types of muscle tissue

Fast twitch muscle fibers - These are the muscle fibers that are responsible for short, explosive and powerful movements. Fast twitch fibers are the ones that grow!

Slow twitch muscle fibers - These are the muscle fibers that are responsible for endurance. They do not really respond to resistance training with any type of growth or hypertrophy.

Everyone's body has a different ratio of fast and slow twitch muscle fibers. it's real easy to figure out. Simply ask the person what type of exercise they enjoy. If they say that they hate weight lifting but love long distance running - that's a slow twitch person right there. If they say that they could live in the gym but hate to run long distances - that is a fast twitch person.