When it comes to tracking fitness progress, two numbers often dominate the conversation: body fat percentage and muscle mass. Both measurements provide useful information but answer different questions. Body fat percentage shows how much of your current body weight is made up of fat, while muscle mass gives you an indication of how much muscle tissue you carry. Neither is inherently more important than the other.
The more useful question isn’t which measurement is better but if the changes you’re seeing support your current goals.
Why Body Weight Alone Can Be Misleading
Your body weight includes fat, muscle, bone, water, and other tissues.
This means the number on the scale may change even when your body fat hasn’t changed significantly. Your weight may also stay the same while you lose fat and gain muscle.
For example, you may notice:
- Your weight remains stable, but your clothes fit differently
- Your body fat decreases while muscle mass increases
- Your weight drops quickly because of changes in water
- Your strength improves even though your weight doesn’t change
- Your weight increases during a muscle-building phase
Tracking body composition provides more context than body weight alone.
Body Fat Percentage Range
General Categories | Women | Men |
|---|---|---|
Essential Fat | 10 to 13% | 2 to 5% |
Athletic Range | 14 to 20% | 6 to 13% |
Fitness Range | 21 to 24% | 14 to 17% |
General Adult Range | 25 to 31% | 18 to 24% |
Above General Reference Range | 32% and above | 25% and above |
Your result should be considered alongside factors such as:
- Your age and sex
- Your sport
- Your training history
- Your current training phase
- Your energy levels and recovery
- The method used to measure body composition
Recent research involving athletes across 18 competitive sports also found considerable variation in body-fat levels. The researchers cautioned against treating the lowest observed values as minimum healthy targets.
Body fat percentages should then be considered as context, not a score you need to chase.
The more useful question is:
Does your current body composition support your training, recovery and performance goals?
What Should You Focus On?
Your Goal | What To Look For |
|---|---|
Fat Loss | A reduction in fat mass while maintaining muscle and performance |
Muscle Gain | An increase in muscle mass without gaining more fat than intended |
Body Recomposition | A gradual reduction in fat alongside stable or increasing muscle |
Athletic Performance | A body composition that supports the demands of your sport |
General Fitness | Sustainable improvements in body composition, strength and wellbeing |
Some examples are that a HYROX athlete needs enough strength and muscle to manage the stations while maintaining the aerobic fitness and running efficiency required across the race, while a distance runner may need to balance strength development against the energy cost of carrying additional body weight.
Body Composition Testing at FORGED by RF: VisBody and Resting Metabolic Rates
At FORGED by RF, body composition testing isn’t simply about receiving a percentage and placing yourself into a category.
The testing process follows three steps:
- Assess your current body, movement or performance
- Analyse what the results mean for your training
- Apply the findings through practical recommendations and programming
FORGED offers both the VisBody 3D Scan and Resting Metabolic Rate Test:
VisBody 3D Scan
The VisBody 3D Scan can help establish a measurable body-composition baseline.
It may be useful if you’re:
- Starting a fat-loss programme
- Beginning a muscle-building phase
- Tracking body recomposition
- Monitoring progress across a training block
- Looking beyond body weight alone
Rather than reacting to a single percentage, you can use repeated scans to understand how your body composition is changing over time.
For example, a stable body weight may look disappointing on the scale. However, your scan may show that you’ve reduced fat while maintaining or increasing muscle.
This gives you a more complete view of whether your programme is producing the intended result.
Resting Metabolic Rate Test (RMR)
Your Resting Metabolic Rate, or RMR, is the amount of energy your body uses at rest to maintain essential functions such as breathing, circulation and temperature regulation.
An RMR Test may add useful context if you’re:
- Planning a structured fat-loss phase
- Trying to gain muscle
- Increasing your training volume
- Unsure whether general calorie estimates suit you
- Looking for a measured resting-energy baseline
Your RMR isn’t the same as your total daily calorie requirement.
Your daily activity, exercise and the energy used to digest food also contribute to your overall energy expenditure.
However, combining body composition information with an RMR measurement can provide a more individualised starting point for nutrition planning than relying solely on scale weight and standard calorie equations.
When to Retest?
For many people, retesting after approximately 8 to 12 weeks of consistent training and nutrition provides enough time to identify a more meaningful trend.
However, the right timeline depends on your starting point, programme and goal.
Where possible, complete each scan under similar conditions. Try to use the same testing method, test at a similar time and follow the preparation guidance provided by the FORGED by RF team. The aim is to understand whether the direction of change supports what you’re trying to achieve.
Conclusion
So, when comparing body fat percentage vs muscle mass, the answer isn’t one or the other — it’s both. Together, they provide the clearest picture of health, performance, and long‑term resilience.
👉 Ready to go beyond the scale?
Explore FORGED by RF’s body composition and performance testing services, which help everyday athletes train smarter and achieve lasting results.
Book now!Contact our team via WhatsApp for help choosing the right assessment.
