Training is the first piece of the puzzle. Nutrition and recovery matter too, but if you’re not actually working out enough, they won’t build strength or muscle.

Building muscle is like making a pizza. Your protein and diet are the dough, the essential building blocks. But the raw dough needs a very hot oven to bake into a strong structure. Stressing your body with resistance training provides those intense conditions to “bake” your amino acids into new muscle. This can’t be done once for a few minutes — it takes weeks or months of consistent, intense work to get results.

Strength, Hypertrophy or Endurance?

Your ideal program depends on your goals. All exercise provides health benefits, but there’s no “best” or “one size fits all” solution.

Strength is the maximal force you can apply against a load. Is lifting the same weight 12 times a measure of strength? It takes some strength, but you could lift more for just one or two reps. So maximum strength is measured by what you can handle for 1 rep — your “1RM” (1 Rep Max). When training for strength, we focus on lower rep ranges and longer rest. For example, 1-3 reps followed by 3-5 minutes of rest, to let the CNS recover from the stress of maximal loads.

Hypertrophy is the increase in size of a tissue — here, your muscles. It mostly comes down to total volume. Research tells us around 2-4 sets of 8-15 reps with 2 minutes or less rest between sets produces the most hypertrophy. Some research suggests volume and proximity to failure matter more than load. So if strength isn’t your main goal, you can build and maintain mass with relatively low loads, as long as intensity is sufficient.

Endurance is the ability to stay in exertion for a long time. It’s not the primary goal for most people, but it deserves a mention. Endurance work builds little strength, but some hypertrophy. It also raises work capacity and lactate threshold, which benefits overall fitness and, in turn, your heavier lifting. Endurance training uses much lighter loads and reps above 15, up to 25 and beyond.

There’s cross-over between these. Training for strength comes with some muscle, and adding muscle through hypertrophy also boosts strength and endurance. Each uses slightly different energy systems, hence the different protocols.

Energy Systems

Your body powers itself with 3 main systems for different types of activity. All run on a chemical called adenosine tri-phosphate (ATP), which fuels all metabolic activity from breathing to running. Most ATP is made from food via your glycolytic and oxidative systems. A small amount is stored in your muscles for your adenosine triphosphate/creatine phosphate (ATP-CP) system.

For sudden, intense activities — sprinting, jumping, very heavy lifting — your ATP-CP system kicks in. It’s the fastest to respond, but also the shortest-lived. Your muscles store only enough ATP for about 6-10 seconds of max effort. Training the ATP-CP pathway improves strength, speed and power, but you can’t increase your stores. Creatine can help slightly — more on that later.

For lower-intensity training with higher reps, ATP-CP is still the first responder, but after those initial 6-10 seconds your glycolytic system (the lactic acid system) kicks in. This keeps you going for another minute or so.

Glycolysis converts carbohydrates into ATP. Here you start to feel the “burn” from a build-up of hydrogen ions. This is the energy source most people want when exercising — it’s the most effective at both building muscle and burning fat.

For long, steady-state exercise (long bike rides, running, or low-load endurance training) your oxidative system takes over. It’s always working in the background, fuelled mainly by fats and glucose, and is the only system that directly requires oxygen.

Whatever your goals, the three main variables you control are volume, frequency and intensity.

Volume

Volume is defined as The total amount of work performed.

There are three common ways to quantify this:

Volume Load = Sets x Reps x Load

Or…

Number of Repetitions = Sets x Reps

Or…

The total number of sets at a given intensity

The latter is the most useful for strength training — the results are more stable and more easily correlated to progress. Research shows that as the number of sets increases, both strength and hypertrophy increase. In fact, when intensity is equated — lifting to near failure — 3 sets of 6-8 produces similar hypertrophy to 3 sets of 15-20.

How much volume is needed to effectively build muscle?

This is where smart programming is vital. The ideal training volume for building muscle is around 9-18 sets, per muscle, per week.

It’s a wide range because it’s so individual. People are stronger or weaker in different lifts, and the bigger compound lifts tax your CNS far more than isolation work.

But if you’re following a well-designed program with good form — 2-4 sets of 6-20 reps, brought within 1-3 reps of failure — the bottom end of the range (9-10 sets) is usually enough to grow muscle.

Doing the least amount of work needed to stimulate growth is where most people want to be, most of the time.

Frequency

How often should you actually workout?

Frequency comes down to choice, schedule and goals. 3 well-programmed workouts a week, around 45-60 minutes each, is a good starting point. More is fine if you prefer. If your goal is maximal strength over hypertrophy, even less can work, given the high CNS stress. The more useful question is:

How often should you train each muscle group?

Most research suggests that for maximal muscle growth (hypertrophy), each muscle group should be trained at least twice a week.

Training 3 times a week, you could do 3 full-body workouts, hitting every muscle group at least once each session.

Or 1 upper, 1 lower and 1 full-body workout — more time to focus on specific areas, with similar frequency per body part.

Training 4 times a week, 2 upper and 2 lower workouts do the trick.

5 times a week may be push, pull, lower, upper, lower.

And 6 times could be push, pull, legs, push, pull legs...

Once you hit 5 or more workouts a week, vary the intensity too — say 2-3 strength-focused and 2-3 endurance and hypertrophy sessions.

Whatever “split” you choose, what matters most is that the frequency suits you and your schedule.

The best program in the world is the one you can stick to.