Strength Training Guide: The 4 Types of Resistance Training and When to Use Them

One of the most important things you can do in the gym is understand how to train for your specific goal. Lifting weights is not one-size-fits-all — the way you structure your sets, reps, rest periods, and tempo determines everything about the result you get.

Here's a complete breakdown of the four main types of resistance training, what each one does to your body, and how to apply them.

1. Strength Training

Strength training uses the heaviest loads, the fewest repetitions, and the longest rest periods of any training style. The goal is to develop maximal force — teaching your nervous system to recruit more muscle fibres and move heavy weight efficiently.

Typical session — the 5x5 system: Five sets of five reps at high loads, with three to five minutes rest between sets.

Time Under Tension (TUT): Strength work keeps TUT low — around 20 seconds per set. The focus is on maximal force production rather than prolonged muscular stress, so reps are performed with controlled but purposeful speed.

What's happening in your body: The neuromuscular system adapts to heavy loads by improving the coordination between your brain and your muscles. You'll notice strength gains before significant size changes — this is your nervous system becoming more efficient, not just your muscles growing.

2. Hypertrophy Training — Building Muscle Size

Hypertrophy training is the method used by bodybuilders and anyone whose primary goal is how to build muscle. It uses moderate weights, higher reps, and shorter rest periods to create the two key drivers of muscle growth: mechanical tension and metabolic stress.

The muscle needs to be pushed close to — or to — failure. This is where lactate builds, micro-damage occurs, and the repair and growth response is triggered.

Typical session: 3–4 sets of 8–12 reps taken to or near failure, with 30–60 seconds rest between sets.

Time Under Tension (TUT): This is where TUT becomes a critical training variable. Aiming for 40–60 seconds per set maximises the hypertrophy stimulus. A common and effective tempo is:

• 3 seconds down (eccentric/lowering phase)

• 1 second pause at the bottom

• 1 second up (concentric/lifting phase)

This keeps the muscle loaded throughout the entire rep, eliminates momentum, and ensures every second of the set is doing useful work.

Hypertrophy vs strength training — what's the difference? Strength training improves your nervous system's ability to produce force. Hypertrophy training changes the physical size of the muscle tissue itself. Most effective long-term programs include elements of both.

3. Power Training

Power training develops your ability to move a load fast. In physics terms, power equals force multiplied by velocity — and this style of training specifically targets the velocity side of that equation.

Loads are lighter than pure strength work, but every rep is performed with maximum speed and intent. Rest periods are long to ensure full recovery between efforts — fatigue kills bar speed, and bar speed is the entire point.

Typical session: 4–6 sets of 3–6 reps at 80–85% of your one-rep max, performed as explosively as possible, with 2–4 minutes rest between sets.

Time Under Tension (TUT): TUT is intentionally kept very low — often 10 seconds or less per set. The concentric phase should be as fast as possible. A longer TUT would introduce fatigue that reduces speed and defeats the purpose of the session entirely.

Who is power training for? Athletes in any sport requiring explosive movement — sprinting, jumping, throwing, or contact sports — will benefit significantly. It's also a valuable addition for anyone wanting to move with more athleticism and reactivity in daily life.

4. Muscular Endurance Training

Muscular endurance training conditions your muscles to sustain repeated effort over time without fatigue. Before making this your primary focus, it's worth asking: what real-world function are you training for?

A runner might prioritise leg endurance. A swimmer their upper body and core. A cyclist their posterior chain. Training with a specific purpose makes the work significantly more effective — and more motivating.

Typical session: 2–3 sets of 12–20 reps (sometimes up to 30), at 60–70% of your max with lighter weights and minimal rest between sets.

Time Under Tension (TUT): Endurance training naturally accumulates the highest TUT of any training style — often 60–90 seconds or more per set. Less about peak tension, more about the muscle's ability to keep firing under sustained stress without breaking down. This is where mental toughness and physical conditioning meet.

Which Training Style Is Right for You?

No single approach is superior — the best method depends entirely on your goal. Here's a simple guide:

Goal	Primary Method
Get stronger	Strength (5x5)
Build muscle size	Hypertrophy (8–12 reps)
Become more explosive	Power (3–6 reps, fast)
Improve stamina	Endurance (12–30 reps)

Many well-rounded programs cycle through all four phases — building a foundation of strength, adding size, developing explosiveness, and building the capacity to keep going. This approach, known as periodisation, is how serious athletes train year-round.

Final Thought

Understanding why you're training the way you are is one of the most powerful tools you have. Every set, every rep, every rest period has a purpose — and when you train with that awareness, results follow far more consistently.

At Keep Fit Matakana, we help our community train with purpose. Whether you're chasing strength, size, speed, or stamina — come in and talk to us about building a programme that works for you.

— Justin, Keep Fit Matakana 📍 Matakana, Auckland | keepfitmatakana.co.nz