Body Recomposition Workout Guide

By R.Davies, PhD・Bodyweight
Published February 06, 2026 | 5 min read

Exercising for body recomposition focuses on progressive resistance training, which is designed to stimulate muscle growth while maintaining or reducing your body fat levels. This article provides workout and training principles aligned with your recomposition goals.

Body recomposition: the simultaneous reduction of fat and increase in muscle, represents a different approach to defining what a “healthy” physical change is. Rather than simply making your body smaller, body “recomposition” focuses on improving what your body is made of.

Beyond Body Weight: Body Composition

Your total body weight consists of many parts: fat mass, skeletal muscle, organs, bones, nerves, water, and connective tissue, to name a few. When you step on scales, you're measuring all of these components together. Whereas, body composition refers to how “much” of these different tissues you have, usually their relative proportions to each other (or sometimes your relative to your height).

The most commonly used body composition measure is the ratio of fat you have relative to your fat-free mass (i.e., muscle, bone, and other non-fat tissues). But many others are looked at as well. The distinction between body weight and body composition matters a lot.

Two people of the same height and weight can look completely different and have vastly different health profiles depending on their body composition. The person with more muscle mass and less fat tissue generally has better health prospects, greater functional capacity, and lower disease risk — even if they weigh the same as someone with more fat and less muscle.

Mechanical Tension: The Primary Biological Signal

Weightlifting is key to training for body recomposition. There is no way around it. When you lift a weight, your muscles generate force in order to move that load, be it a barbell, dumbbell, kettlebell, or your own body weight. This creates “mechanical tension” in your muscle, just like when you flex or 'tense' your muscles when posing in the mirror.

When you “overload” a muscle, meaning you lift weights until they are either too heavy to lift or you become too tired to lift them anymore, your body recognises this tension in your muscle as a signal to grow and become stronger [1]. Your muscle does this by growing your individual muscle cells (or muscle “fibres”), which make more protein (than they normally do) and therefore end up getting bigger and stronger.

From Signal to Structure: Muscle Protein Synthesis

After a heavy bout of resistance training, your body starts the process of making more muscle protein, which lasts for up to 48 hours (assuming you’re eating enough protein). The training provides the signal, and the dietary protein provides the material for you to build new muscle.

It is important to understand that you aren’t simply repairing the muscle that has been worn and torn and restoring it to its previous state. It’s an adaptive process. You are repairing the damage, and you're making more muscle, and stronger muscle, making it more capable of handling stress in the future.

All of this is happening at the cellular level, meaning you aren’t going to notice any growth after a single session. However, over time, and with repeated training, these small changes will accumulate into noticeable changes (in both strength and size).

What About Cardio?

Studies show that aerobic exercise (or cardio) can burn fat, but it doesn’t build (large amounts of) muscle [2]. But does this mean it has no place in your recomposition plan? Not necessarily. Aerobic exercise, like walking, cycling, and running, increases energy demands and burns calories, which can help create the energy deficit needed for fat loss.

Although you are undoubtedly using your muscles, it doesn’t seem to generate the amount of mechanical tension required to trigger meaningful muscle growth. The contractions your muscles are doing during cardio are light, low-force, and repetitive, which doesn’t challenge the muscle in the same way heavy resistance training does.

This doesn’t mean you should avoid cardio. In fact, it offers several health benefits and can actually help lose fat. However, it is not a substitute for resistance training. But if you want to maximise body recomposition (and general health), you should probably be doing both.

Progressive Overload: Adaptation Requires Progress

Your body will adapt to the demands placed upon it. Once it has successfully adapted to a given amount (or intensity) of work, that 'stress' is no longer challenging enough to trigger any further adaptations. This is why “progressive overload”, gradually increasing training demands over time, is needed for continued growth.

This doesn’t necessarily mean consistently adding weight to the bar (although it's the most common way to do it) — it can involve increasing the number of reps, sets, reducing the rest period, or even improving your technique or form. This is particularly important for body recomposition, as maintaining (or increasing) the training volume is one of the key determinants of preserving muscle mass during energy deficits.

Training During an Energy Deficit: Difficult but Not Impossible

There's a common misconception that you cannot build muscle in an energy deficit, only maintain it. Whilst an energy deficit indeed creates constraints and is not optimal, it doesn't eliminate your ability to build muscle if you weight train. When combined with adequate dietary protein intake, resistance training can stimulate muscle growth. Yes, it is not as easy or efficient as building muscle while in a calorie surplus — but it can still be done [3].

The size of the deficit matters. Very large deficits (over 500 kcal a day) will impair the capacity to build muscle, and it’ll also impair your ability (or thus quality) of your training, which will indirectly affect your capacity to stimulate growth. Generally, the smaller the energy deficit, the better your chances are of preserving or building muscle. For optimising recomposition, rather than fat loss, very large calorie deficits should be avoided [4].

The Indirect Benefits: How Muscle Growth Supports Fat Loss

Beyond directly building muscle, resistance training offers several indirect benefits that support fat loss. Whilst these aren’t going to be the primary drivers of fat loss, they will certainly help.

First, muscle is metabolically active, so increasing muscle mass does contribute to a higher resting metabolic rate, meaning you burn more calories throughout the day. Over a year, five extra kilograms of muscle will use the energy equivalent of about 2-3 kg of fat.

Second, resistance training itself burns energy, both during the workout and even for a few days after exercise. The more training you do, the more energy you’ll expend. This can accumulate over time and meaningfully increase your energy expenditure.

Third, the more muscle you have, and the stronger that muscle is, it means that your work capacity increases. You can move more weight, more often, and increase your training volume over time. This means higher energy expenditure. It may also make daily activities easier and may encourage you to be more physically active [5].

Finally, the muscle itself can influence your metabolism. Trained muscle becomes more efficient at utilising fat as a fuel source, particularly at rest and during lower-intensity activities. This may help fat-loss pursuits.

The Non-Negotiable Foundation

The message is straightforward: if body recomposition is your goal, resistance training isn't optional — it's essential. No amount of protein, no degree of caloric deficit, and no volume of cardio can substitute for it. You don't need to spend hours in the gym either.

3 Quick Questions

Q: Can I build muscle with body weight exercises, or do I need to lift weights?

Any form of resistance that creates (sufficient) mechanical tension can stimulate muscle growth. Body weight exercises are effective, particularly for beginners, as long as they're challenging enough. As you get stronger, you'll need to find ways to increase the difficulty.

Q: How quickly do I need to progress to keep building muscle?

There's no fixed timeline. Progress naturally slows over time. What matters is that you're attempting to do slightly more workloads than you previously could. This might not happen every session, but keep an eye on the overall trend.

Q: If I'm losing fat, does that mean my training is working, even if I'm not getting stronger?

Fat loss indicates you're in an energy deficit, but it doesn't necessarily mean you're building muscle. However, ideally, you want to be improving your strength over time. If you’re getting weaker, you probably need to review your training and/or nutrition.

Sources

1. Schoenfeld BJ. The mechanisms of muscle hypertrophy and their application to resistance training. J Strength Cond Res. 2010 Oct;24(10):2857-72. PMID: 20847704

2. Willis LH et al. Effects of aerobic and/or resistance training on body mass and fat mass in overweight or obese adults. J Appl Physiol (1985). 2012 Dec 15;113(12):1831-7. PMID: 23019316

3. Ribeiro AS et al. Effects of Different Dietary Energy Intake Following Resistance Training on Muscle Mass and Body Fat in Bodybuilders: A Pilot Study. J Hum Kinet. 2019 Nov 30;70:125-134. PMID: 31915482

4. Murphy C, Koehler K. Energy deficiency impairs resistance training gains in lean mass but not strength: A meta-analysis and meta-regression. Scand J Med Sci Sports. 2022 Jan;32(1):125-137. PMID: 34623696

5. Hunter GR et al. Resistance training increases total energy expenditure and free-living physical activity in older adults. J Appl Physiol (1985). 2000 Sep;89(3):977-84. PMID: 10956341

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Published: February 06, 2026

Lead Author: R.Davies, PhD | Author Bio

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