When people think about strength training, they often think in terms of numbers.

3 sets of 10.

3 sets of 12.

15 repetitions.

20 repetitions.


And while there is nothing wrong with those numbers, they can sometimes distract us from what actually matters.


The goal of strength training is not to complete a certain number of repetitions.

The goal is to challenge the muscle enough that it has a reason to become stronger.

That is what your body responds to.

Not the number 10.

Not the number 12.

But the level of challenge.


This becomes especially important after 40.

Many people assume that doing more repetitions is the best way to make an exercise harder.

Sometimes that works.

But it also means repeating the same movement over and over again, which can place a lot of stress on muscles, tendons, and joints.

Instead of always adding more repetitions, consider adding more resistance.

- A heavier hand weight.

- A stronger resistance band.

- A more challenging variation of the exercise.

When your goal is to build strength and maintain muscle mass, increasing the load is often more effective than simply doing more repetitions.


In fact, you do not necessarily need 12, 15, or 20 repetitions.

Sometimes 5 to 7 repetitions can be enough if the resistance is challenging.

The key is that the muscle should be working close to its limit by the final few repetitions.

This is often referred to as training close to muscle fatigue. Not complete exhaustion, and certainly not pain, but reaching the point where you feel you could only manage a few more repetitions with good technique.

That is where strength improvements happen.

Another reason this matters after 40 is recovery.

As we get older, recovery becomes increasingly important.

Doing very high repetitions means more total work, more energy expenditure, and often more fatigue.

That does not automatically make it better.

In fact, if excessive fatigue leaves you too tired to train consistently, it may be slowing your progress rather than helping it.


The goal is not to leave every workout exhausted.

The goal is to give your body enough challenge to stimulate improvement and then enough recovery to adapt and become stronger.

Strength training should help you maintain muscle mass, support bone health, improve balance, and keep you capable and independent for years to come.

So next time you exercise, don't focus too much on the number of repetitions.

Instead, ask yourself:

"Is this challenging enough for my muscles?"

Because when it comes to strength training after 40, the challenge matters far more than the number.


Move Smart Tip of the Week

If you can comfortably perform 20 repetitions of an exercise and still feel like you could continue, the exercise may not be challenging enough to improve strength.

Try increasing the resistance or choosing a more difficult variation and aim to finish the set feeling that you could only perform another 2–3 repetitions with good technique.