Cardio or weight training for fat loss
The short answer
If you can only do one, do weights. The calorie deficit is what removes the fat, and weight training is what decides whether you lose fat or muscle while it happens. Cardio adds to the deficit and is worth doing for your heart regardless of your waist. For most people three weight sessions and two easier cardio sessions a week works better than either on its own, and through a Surat summer the cardio belongs early in the morning or indoors.
Written by Brijesh Joshi
Founder of S R Gym, Surat, coaching since 1999. President of the Strength Bodybuilding Association South Gujarat and a registered IBBFF judge. See credentials.
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The question is usually posed as a choice, and it is more useful to understand what each one is doing. They contribute in different ways, and the mistake most people make is assuming the one that burns more calories in the moment is the one that matters most.
What each one contributes
Cardio burns calories during the session. Thirty minutes of steady running or cycling might use two to four hundred calories depending on your size and effort. It also improves cardiovascular health, which is worth having independently of how you look.
Weight training protects your muscle. When you eat less than you burn, the body draws on both fat and muscle. Resistance training is the signal that tells it to keep the muscle and take more of the deficit from fat. It burns fewer calories per session than cardio, and it decides what your body composition looks like at the end.
Neither creates the deficit. That comes overwhelmingly from food. This is the part people find hardest to accept, and the reason someone can train six days a week for a year with very little to show for it.
Why weights usually matter more, if you must choose
Consider two people who both lose ten kilos. The first dieted and ran. The second dieted and lifted.
The first has lost perhaps seven kilos of fat and three of muscle. They are lighter, softer than they expected, and now need fewer calories to maintain their new weight, which makes keeping it off harder. This is a large part of why weight comes back after dieting.
The second has lost close to ten kilos of fat and held most of their muscle. They look meaningfully different rather than merely smaller, and their maintenance calories are higher, so holding the result is easier.
Same number on the scale, two different outcomes. It is the single clearest argument for resistance training during any fat loss phase.
The case for doing both
In practice you are not choosing. A sensible week for someone losing fat looks like three or four resistance sessions and two or three easy cardio sessions, plus walking most days.
Cardio in that arrangement does three useful things. It adds to your weekly energy expenditure without requiring a deeper cut in food. It improves your conditioning, which makes the weight training itself more productive. And it is good for your heart, which matters more than anything on this page.
A week that works
- Monday. Resistance training, lower body focus.
- Tuesday. Resistance training, upper body focus.
- Wednesday. Twenty to thirty minutes easy cardio, or a long walk.
- Thursday. Resistance training, full body.
- Friday. Resistance training, or cardio if the week has been heavy.
- Saturday. Cardio, or sport, or something you actually enjoy.
- Sunday. Rest. Both S R Gym branches are closed anyway.
Walk on most of those days regardless. Daily movement outside training adds up to more than the sessions themselves for most people, and it costs almost nothing in recovery.
Ordering them within a session
If you are doing both on the same day, lift first. Cardio beforehand leaves you tired for the lifts, which lowers the load you can handle and weakens the very stimulus that is protecting your muscle. A five to ten minute warm-up on a bike or treadmill before lifting is a different thing and is useful.
Training through a Surat summer
From March onwards, outdoor cardio in the afternoon becomes unpleasant and occasionally unwise. Move it early or late, drink considerably more than you think you need, and expect your performance to drop through the worst weeks. That drop is the weather. Both branches open early for exactly this reason, with Katargam from 5:00 am and Adajan from 6:00 am.
Where a doctor comes in
If you have a heart condition, high blood pressure, or you have been inactive for several years, get cleared before starting hard cardio. Chest pain, unusual breathlessness or dizziness during exercise is a reason to stop and seek advice rather than to push through.
Cardio and weights: common questions
- Is cardio or weight training better for fat loss?
- Cardio burns more calories inside the session, and weight training protects the muscle you would otherwise lose while in a calorie deficit. Since the deficit itself comes mainly from food, weight training tends to matter more for how you end up looking, and doing both beats choosing between them.
- Should I do cardio before or after weights?
- After, if you are doing both in one session. Cardio first leaves you fatigued for the lifts, which reduces the load you can handle and therefore the stimulus that protects your muscle. A short warm-up before lifting is a different thing and is worth doing.
- How much cardio should I do to lose fat?
- Two to four sessions of twenty to forty minutes a week alongside resistance training suits most people. Walking daily contributes more than most people expect and is far easier to sustain than adding more hard sessions.
- Does cardio burn muscle?
- Very large volumes of cardio in a deep calorie deficit, without resistance training and without adequate protein, can cost you muscle. Ordinary amounts alongside weight training and sufficient protein will not.
- Is walking enough to lose weight?
- Walking helps considerably and is the most sustainable form of activity for most people, but weight loss is determined mainly by what you eat. Walking alongside an adjusted diet works well; walking while eating unchanged usually produces little.
Watch Brijesh on this
Covering the same ground as this page, in Hindi, in his own words.
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