If you want to gain muscle you need to approach your training with intentionality. Strength and size don’t just happen automatically because you pick up a barbell.
To make your muscles grow, you have to use them a lot and keep making them work harder over time.
There are two main strategies to lift intentionally for muscle growth
- Time under tenson
- Hypertrophy training
Both rely on consistency, proper form, and progressive overload, but they target growth in slightly different ways. Add in tempo work, and you’ve got a powerful combination to make your training more effective. In this blog post, we will dive deep into some effective strategies to help you build muscle more effectively.
1. Time Under Tension: The Foundation of Muscle Growth
Muscle growth happens when your muscles are under stress long enough to signal your body to repair and grow stronger. This is called time under tension and it is how long a muscle spends actively contracting during a set.
- How long should muscles be under tension?
Research shows that muscles respond best when a set lasts between 30 to 60 seconds. If you’re blasting through your reps in 10–15 seconds, you’re missing the sweet spot.- Check out this article for more on the science behind muscle growth: https://pmc.ncbi.nlm.nih.gov/articles/PMC3285070/
- Full range of motion matters.
Half reps cheat you out of growth. Lower all the way down, extend fully, and work the muscle through its complete range of motion. Not only will this build more muscle, but it also improves joint health and mobility. - Weight as a factor.
Heavier isn’t always better. You need enough weight to challenge your muscles within that 30–60 second window, but not so much that you sacrifice form. A good rule: if you can’t control the weight or complete the full range of motion, it’s too heavy.
2. Hypertrophy: High Rep, Moderate Weight
Hypertrophy refers to increasing the size of your muscle fibers, and the classic way to train it is with moderate weight and higher reps.
What does that look like?
Think of movements like squats, push-ups, or dumbbell presses performed for 15–30 reps per set. These longer sets accumulate more seconds under tension and pump more blood into the muscle, both of which trigger growth.
What kind of exercises should you do?
The best choices are functional, full-body exercises like deadlfits, pull-ups, squats and presses. These exercises use multiple muscles through a full range of motion and carry over to real-life strength and movement.
Why not just max out?
Lifting heavy for low reps (1–5) is great for absolute strength but doesn’t give your muscles the volume they need to grow.
On the flip side, very high reps with no resistance (like 100+ single unders) build endurance more than size.
The sweet spot is controlled sets of 8–12 or 12–15 reps, depending on the exercise.
Bodyweight counts too.
Don’t sleep on simple moves like air squats, push-ups, or lunges. Done for high volume with proper form, these can deliver serious hypertrophy, especially if you add tempo (more on that below).
3. Tempo: Slowing Down to Speed Up Growth
One of the most overlooked tools for building muscle is tempo, which is the speed at which you lift. Instead of rushing through a set, intentionally control every phase of the movement.
Eccentric focus (the way down).
Most muscle damage—and therefore growth—happens during the lowering portion of a lift. For example, in a squat, that’s the descent. Slow it down to 3–5 seconds to maximize the benefit.
Add a pause.
Holding at the bottom of a squat or just at your chest on a bench press eliminates momentum and forces your muscles to do the work. Even a one-second pause will increase difficulty.
Controlled concentric (the way up).
While you don’t always need to go as slow on the way up, resisting the urge to “bounce” or rush keeps the muscle under tension longer and teaches control.
Progressive overload with tempo.
As you get stronger, add weight gradually, but never at the cost of form or range of motion. It’s better to go lighter and slower than heavier and sloppy.
Putting It All Together
If your goal is to gain muscle, your training should combine all three elements:
- Prioritize time under tension. Aim for sets that last 30–60 seconds.
- Train in the hypertrophy range. Stick with 8–15 reps per set, using moderate weight.
- Use tempo to your advantage. Control the eccentric, add pauses, and lift with intention.
Use these three rules during your training and you will build muscle faster than before.
👉 If you want to grow stronger and see results faster, slow down, focus on form, and give your muscles the time under tension they need.
Our small group classes are geared towards building strength with absolute strength lifts (1-5 reps) with some occasional hypertrophy workouts. Check out our class workouts here for an example of our training.
Our personal training clients, however, are mostly solely focused on building muscle through this kind of training. If you want to book a free no-sweat intro to learn more about how personal training can help you build muscle faster, you can book a free no-sweat intro to talk with a coach about your fitness goals.
