Mechanical tension drives muscle growth. Research shows that lifting a lighter load to failure produces gains in muscle size similar to those produced by lifting a heavy load to failure. The scientific evidence on rep ranges tells us that there’s no magical range for maximizing muscle size. You can use both heavy, low-rep (1-5) sets along with medium-load, high-rep (15-20+) sets if you’d like. But many people focused on building muscle are usually not interested in using weights so heavy that they can only do five or fewer reps with it. And that’s fine. Doing some sets in the six to eight rep range serves as a nice middle ground.

The amount of weight you’re using also determines the quality of reps you’re doing. If the load is too heavy, you may not be able to do good-quality reps. That said, at any given time at any big-box gym, you’ll see at least one guy doing biceps curls or shoulder raises, and he’ll have to thrust his lower back into it each time he brings the weight up. It’s easy to make this mistake. After all, you’re in the gym to lift weights, and everyone knows heavy loads are an effective stimulus for muscle growth, right? Well, sort of.

Training to maximize muscle isn’t about becoming a weightlifter. It’s about using weights as a tool to increase your muscle size and strength. Simply moving as much weight as you can is a less effective and a risky approach. Here’s what happens when you use weights that are too heavy:

  • You reduce the time under (mechanical) tension because you’re forced to use momentum to cheat.
  • You’re unable to lower the weight slowly and with control, further reducing your time under (mechanical) tension.
  • You use more muscles, which reduces the accumulated pump (metabolic stress) in muscles you’re trying to target.

Training to maximize muscle isn’t just about moving the weight from one point to another as you would when powerlifting or Olympic weightlifting. It’s about controlling the weight through the entire range of motion. The point of emphasis on each rep is to avoid swinging the weight up or cheating by using other parts of your body to move the load.


Perform the concentric (lifting) portion of each rep at a normal tempo and maintain control during the lowering portion for about three seconds on each rep. When you’re trying to maximize gains, controlling the weight and minimizing momentum also applies to the eccentric (lowering) portion of each rep. People who cheat the weight up normally also let the weight come crashing back down. When getting the most gains from each rep are the focus, maintaining deliberate control is paramount.

Letting the weight swing down without control may be even more ineffective than you think. Evidence demonstrates that a slower (four-second) eccentric action during biceps curls produces more arm growth than a one-second eccentric action (2). This makes perfect sense. Lowering slowly creates more mechanical tension on the working muscles than a shorter eccentric portion does.

And because cheating creates an overload of mechanical tension only in a small range of the motion, it’s more likely that you’ll use a weight that’s too heavy for you, making the muscles deal with forces that exceed the structural integrity of your tendons and ligaments. Injuring yourself isn’t conducive to building muscle. If you want to maximize your size gains, maximize your time under tension by using strict form and a controlled eccentric portion lasting about three to five seconds, with three seconds being a sweet spot that doesn’t take too long on each rep.


The amount of weight you use on each set is determined by the number of reps you’re doing relative to your strength level. Choose a load that leaves you unable to perform any more reps than indicated on your workout program, but without cheating by using additional jerking, twitching, or momentum. If your program calls for three sets of 8 to 12 reps, grab a weight that allows you to complete at least 8 reps using proper form, but not so light that you can do more than 12 reps before reaching technical failure.

Also, if you’re using the same weight for each set, you may be able to do 12 reps on the first set, 11 on the next set, and 10 on the third set because of accumulated fatigue. Or you can reduce the weight you’re using with each consecutive set to achieve the higher end of the given rep range on each consecutive set. Both methods are effective, but using the same weight on each set often makes the most logistical sense, especially when training in a busy gym.


If you’re looking to bring up certain lagging muscle groups, the first thing you need to do is count the total number of sets you’re doing each week for those muscles to see whether you’re getting at least 12 sets per week on each area. If you’re already hitting that minimum, then it’s time to add a few more total sets per week to those muscle groups. You can apply this to any of the workout plans for strength zone training in this book by simply adding a few extra sets of the exercises that hit the muscle groups you want to develop most.


The best type of training split is determined by how many days per week you’re training. It all comes down to getting in enough training volume of each muscle group throughout the week. If you’re training two or three times per week, total-body workouts are best. If you’re training four times per week, an upper-body, lower-body split is the best. If you’re training five or six times per week, a body-part split is best in order to allow sufficient recovery of each muscle group between workouts. You can use either a three-day-on and one-day-off rotation, or use a four-day-on, one-day-off rotation.

Regardless of which setup you use, you have flexibility. You can always throw in a few extra sets for a muscle group that is not the focus of a particular day’s workout if you want to spark more growth.


Resting three to five minutes between sets produced the greatest increases in strength by allowing your body the optimal amount of time to recover. Higher levels of muscular power were demonstrated over multiple sets with three to five minutes of rest than with one minute of rest between sets. Resting longer than three to five minutes doesn’t further increase performance. Plus, you have only so much time to work out anyway.