Is Cardio, Intervals Or Weight Training Better For Fat Loss?
Fat loss, fat loss, fat loss. Everyone wants it. But is it better to run for 30 minutes four times a week, lift weights, or sprint up a hill? Let's put the three main training methods head to head.
The golden rule first: for weight loss, what you eat matters more than which workout you choose. You cannot easily out-train a diet heavy in sugary drinks and ultra-processed food. Exercise is still vital for health, fitness and keeping weight off, so let's look at what each type offers.
Steady-state cardio
This is continuous, moderate-intensity aerobic exercise: jogging, cycling, swimming, the elliptical or a brisk walk. It is simple, needs almost no technique and is great for heart and lung health.
Pros: easy to start, low injury risk at moderate volumes, sociable (a 10 km fun run with a friend), and you can keep it up for a long time.
Cons: it can get boring, your body adapts so the same session becomes easier, and on its own it does little to build muscle.
High-intensity interval training (HIIT)
HIIT alternates short bursts of very hard effort with recovery: sprint, walk, sprint again. It is time-efficient and improves cardiovascular fitness quickly.
Some studies have found impressive results. An Australian study from the University of New South Wales reported that young women doing 20 minutes of sprint intervals three times a week for 15 weeks lost more body fat than a group doing 40 minutes of steady cycling. Larger reviews suggest the difference is usually modest: HIIT produces similar fat loss to longer moderate sessions, but in less time. Hard exercise also raises your energy use for a while afterwards (sometimes called the afterburn or EPOC), though this effect is smaller than it is often made out to be.
Cons: it is genuinely hard, you cannot do it every day, and beginners should build some base fitness first.
Weight training
Lifting weights or using your body weight (squats, push-ups, rows, presses) builds and maintains muscle. During weight loss that matters a lot, because losing muscle lowers your metabolic rate and makes you weaker.
A 2012 study in the Journal of Applied Physiology from Duke University compared aerobic training, resistance training and a combination in overweight adults. The aerobic groups lost more weight and fat than the resistance-only group, the resistance groups gained lean mass, and the combination gave the best overall body composition. In other words: cardio for burning energy, weights for keeping muscle, both for the best result.
For fat loss, focus on compound exercises that use several muscles at once: squats, deadlifts, rows and push-ups. Doing them as a circuit keeps your heart rate up too.
Cardio on the Las Vegas Strip
Here is a cardio session most people do without realising it. The Las Vegas Strip runs for roughly 4.2 miles (about 6.8 km) along Las Vegas Boulevard, and the resorts on it are enormous. Walking from your room to the casino floor, across a pedestrian bridge and into the next resort can easily be a kilometre, and visitors who explore on foot commonly clock 15,000 to 20,000 steps a day. That is steady-state cardio, whether you planned it or not.
The catch is the desert heat, which in summer often passes 40°C (104°F). Walk early in the morning or after dark, carry water, and use the air-conditioned walkways between resorts. Mix in a short interval session in the hotel gym and a couple of bodyweight circuits and you have covered all three training types on holiday. Our full guide is how to stay fit on a Las Vegas trip.
And the winner is…
All three work. The best choice depends on your goals, your fitness level and your time:
| Your situation | Good starting point |
|---|---|
| Brand new to exercise | Walking or easy steady cardio, plus simple bodyweight strength twice a week |
| Only 20 to 30 minutes a day | HIIT or circuit training two or three times a week, walking on other days |
| Long-term health and body shape | A mix: two or three strength sessions plus cardio and some intervals |
| Bored of running | Add weights. Seriously. |
A balanced week might look like three strength sessions, two short interval sessions and some steady cardio or long walks. Choose something you enjoy, because the programme you stick with is the one that works.
This article is general information, not medical advice. Check with a doctor before starting a new diet or exercise programme, especially if you have a health condition.