Understanding reps, sets and progressive overload — and how to make your gym workouts really work for you.
If you’re regularly going to the gym, attending Body Pump classes or lifting weights, that’s fantastic. You’re already doing something incredibly positive for your health.
But here’s a question.
Are you actually challenging your muscles enough to make them stronger and help them grow?
I see women working hard in the gym, repeating the same exercises, using the same weights and doing the same number of repetitions week after week.
And while they’re certainly benefiting from moving their bodies, they may not be giving their muscles the challenge needed to continue progressing.
This is where something called progressive overload comes in.
And understanding it could completely change the results you get from your workouts.
1. First, What Are Reps and Sets?
Let’s start with the basics.
A rep, short for repetition, is one complete movement of an exercise.
For example, if you’re doing a bicep curl, lifting the dumbbell and lowering it again counts as one repetition.
A set is a group of repetitions performed together before taking a rest.
So if your programme says:
3 sets × 10 repetitions
That means:
Perform 10 repetitions.
Take a rest.
Repeat another 10 repetitions.
Rest again.
Complete your final 10 repetitions.
That’s 30 repetitions altogether, divided into three sets.
Simple!
2. What Is Progressive Overload?
Progressive overload is one of the most important principles of strength training.
It simply means gradually increasing the challenge you place on your muscles as they become stronger and more capable.
Our bodies are wonderfully adaptable.
When we first start lifting weights, our muscles respond to the new challenge. Over time, they adapt, and what once felt difficult becomes easier.
But if we continue doing exactly the same thing, we may eventually stop making progress.
To keep improving, we need to keep giving our muscles a reason to adapt.
For example:
Week 1: You perform 10 squats holding a 6 kg dumbbell.
Week 2: You manage 12 squats with the same weight.
Week 3: You increase to an 8 kg dumbbell and perform 10 squats.
Week 4: You manage 12 squats with your 8 kg dumbbell.
That’s progressive overload.
You’re gradually increasing what your muscles can do.
And it doesn’t always mean lifting heavier. You can also progress by improving technique, increasing repetitions, adding a set or gradually increasing the total work performed.
3. What’s the Difference Between Strength, Muscle Growth and Muscular Endurance?
This is where understanding your training goals becomes really useful.
There are three overlapping but slightly different outcomes of resistance training.
Muscular Strength
Strength is your ability to produce force — how much weight you can lift.
If your goal is to become stronger, training with relatively heavy weights and fewer repetitions is particularly effective.
For example, performing 3–5 sets of 3–6 repetitions with a challenging weight and sufficient rest.
This helps improve both muscle function and the nervous system’s ability to recruit muscle fibres.
Muscle Growth (Hypertrophy)
Hypertrophy is the scientific term for increasing the size of your muscles.
Muscle growth can occur across a wide range of repetitions, provided the resistance is sufficiently challenging and you progressively increase the training stimulus.
A particularly practical approach is 3 sets of 8–12 repetitions.
The important thing is that the final few repetitions should feel difficult while you can still maintain good technique.
If you finish 12 repetitions feeling you could easily perform another 10, the weight is probably too light for efficient muscle-building training.
Muscular Endurance
Muscular endurance is the ability of your muscles to perform repeated contractions or sustain activity over time.
This is often developed by using lighter weights for higher repetitions.
Think 15–20 repetitions or more, with shorter rest periods.
It’s particularly useful for activities requiring repeated muscular effort.
And this is where classes such as Body Pump come in.
4. Body Pump Versus Lifting Heavier Weights
I love the energy of a group exercise class.
The music, motivation, atmosphere and sense of achievement can make exercising incredibly enjoyable.
Body Pump uses relatively light to moderate weights with lots of repetitions, often working each muscle group through a long sequence of movements.
It’s an excellent way to develop muscular endurance, improve confidence with weights and introduce resistance training.
For beginners, it can also help develop muscle and strength.
But there’s a difference between doing lots of repetitions with a light weight and lifting a weight that genuinely challenges you.
If your goal is to increase muscle size, improve your strength and change your body composition, a structured resistance training programme can make progressive overload easier to achieve.
For example:
In a Body Pump class, you might perform dozens of squats using a relatively light barbell.
In the gym, you might perform 3 sets of 8–10 squats with a heavier weight, resting between sets.
Both have benefits.
But the second approach allows you to focus on gradually increasing the resistance and tracking improvements in strength and muscle growth.
You don’t have to choose one or the other.
Body Pump can be part of an enjoyable fitness routine alongside dedicated strength-training sessions.
5. How Heavy Should You Actually Lift?
Here’s a useful rule.
Your last two or three repetitions should feel challenging, but your technique should remain controlled.
Let’s say you’re performing 10 repetitions of a dumbbell shoulder press.
If you reach repetition 10 and feel you could easily perform another 10, it’s probably time to consider increasing the weight.
If you reach repetition 10 and feel you could only manage another one or two with good technique, you’re working at a useful intensity for building muscle.
You don’t need to push yourself to absolute failure every time.
And you certainly don’t need to lift the heaviest weight in the gym.
The aim is to choose a weight that challenges you, based on your current strength and experience.
6. Why Progressive Overload Matters Particularly for Women Over 40
From around our thirties and forties, we can begin to experience gradual age-related changes in muscle mass and strength.
These changes can become more noticeable later in life, particularly if we’re inactive.
The age-related loss of muscle mass and function is associated with a condition called sarcopenia.
But muscle loss isn’t inevitable at a fixed rate, and there is so much we can do to protect our strength.
Resistance training helps us:
Build and maintain muscle mass.
Improve physical strength and everyday function.
Support bone health.
Improve insulin sensitivity and metabolic health.
Maintain balance, mobility and independence.
Support healthy body composition.
And importantly, we can continue building muscle well into our sixties, seventies and beyond.
It’s never too late to start.
7. Will Lifting Heavier Weights Make Me Bulky?
This is something I hear from women regularly.
And the answer is that lifting heavier weights won’t suddenly make you bulky.
Developing substantial muscle size requires consistent training, sufficient nutrition, time and an appropriate training stimulus.
Most women who begin progressive resistance training notice improvements in strength, muscle definition and confidence.
Rather than worrying about becoming too muscular, I encourage women to think about what having stronger muscles will give them.
The ability to lift, carry, climb, travel, exercise and enjoy life with confidence.
Muscle is something to celebrate.
8. How to Start Progressive Overload
You don’t need a complicated training programme.
Start with a handful of exercises that work your major muscle groups.
For example:
Leg press or squats.
Seated row.
Chest press.
Shoulder press.
Lat pulldown.
A core exercise such as a plank.
Begin with a weight you can lift comfortably and safely for around 8–12 repetitions, with the final repetitions feeling challenging.
Try performing 2–3 sets of each exercise.
Write down the weights and repetitions you complete.
Then, as you become stronger, gradually increase the repetitions or weight.
For example, if you’re comfortably completing all three sets of 12 repetitions on the leg press, you could increase the weight slightly and work back towards 8–10 repetitions.
Remember that progression isn’t always linear. Some weeks you may lift more, and other weeks you may need extra recovery.
Consistency matters much more than increasing the weight every single session.
9. Don’t Forget Protein and Recovery
Muscles don’t grow simply because we lift weights.
Resistance training provides the stimulus, but our bodies also need sufficient nutrition and recovery to adapt.
Protein provides the amino acids required for muscle repair and growth.
For many healthy, active adults aiming to build muscle, approximately 1.2–1.6 grams of protein per kilogram of body weight per day is a useful starting range, with some people benefiting from higher intakes depending on their training and circumstances.
Getting adequate sleep, eating enough food and allowing muscles time to recover are also essential.
Training hard every day without sufficient recovery isn’t necessarily going to produce better results.
10. My Message to Women in the Gym
I want more women to feel confident walking into the weights area of the gym.
To understand what they’re doing, why they’re doing it and how to make progress.
You don’t have to lift enormous weights.
You don’t have to train like a bodybuilder.
And you certainly don’t need to compare yourself with anyone else.
But I do want you to challenge yourself.
If you’ve been lifting the same 3 kg dumbbells for the last two years, perhaps it’s time to see what you’re capable of.
You might be surprised by how strong you already are.
Don’t just exercise. Train with purpose.
Build strength. Build muscle. Build confidence.
And invest in the body that’s going to carry you through the next twenty, thirty or forty years.
In Flow Studio | Personal Training, Nutrition & Healthy Ageing
Strong today. Stronger tomorrow. Age strong.
