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Is Cardio Necessary For Super-Low Body Fat?

Bodybuilders and fitness models need more than strength training and a good diet to get shredded. But how much more? - by Lou Schuler
  • 14 Aug 2017
Is Cardio Necessary For Super-Low Body Fat?
Instagram/Aidan Broddell

You’ve probably heard a fitness guru declare, with biblical certainty, that “abs are made in the kitchen.”

It’s one of the more absurd clichés. The guys you see in Men’s Health, or in supplement ads, or posing down in a bodybuilding contest, built those bodies in the weight room, and then employed superhuman discipline to stay out of the kitchen while dieting down to photo-ready shape.

RELATED: what does a men's physique champion eat every day?

But there’s one more part of their program, and it involves something the average meathead doesn’t like to think about: cardio. We know anecdotally that bodybuilders do a lot of it. But is it absolutely necessary?

“I think it is,” says Christian Finn of muscleevo.net, a veteran fitness expert who’s trained himself and others to get ultra lean. But it also depends on how low you need to go.

“You can get ‘looking good on the beach’ lean without any cardio,” he says. “And there are folks with fast metabolisms who can get ‘abs visible from across the room’ lean without cardio. But for most people most of the time, some form is going to be necessary.”

That brings us to the more pressing questions: how much cardio, and what kinds?

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MH
Aidan Broddell Instagram

Cardio and Low Body Fat

In a recently published case study of a natural bodybuilder, the authors reported that he did five 40-minute cardio sessions a week in the final month of his contest prep. He did well: In 14 weeks, he cut his body fat in half (from 14 to 7.2 per cent) and finished seventh out of 19 entrants.

But he also lost 5kg of muscle, which was 43 per cent of his total weight loss, and higher than expected. The researchers wondered if excessive cardio created too big a calorie deficit, noting that the less body fat you have, the less there is to lose.

A recent study in the Journal of Sports Medicine and Physical Fitness offers two reasons for concern:

  • Strength and endurance exercise develop different fibres in different ways, only one of which will look impressive on the beach.
  • Both types of exercise drain glycogen from muscles, potentially leaving a lifter with limited fuel for training when he’s simultaneously cutting calories.

You won’t be surprised to learn that the interference effect is most pronounced in the muscles you force to do double duty. Running especially has been shown to affect strength and size in your lower body, due to the fact that running induces more muscle damage. Walking and cycling are safer choices.

Which brings us to intensity. We know high-intensity interval training—HIIT—causes less interference with strength training. But that’s because it’s so similar to strength training, which, as Finn points out, “is itself a form of intense intermittent exercise,” if you’re doing it right.

Intense exercise requires recovery. Two forms of intense exercise only increase that requirement, especially when you’re also dieting down to reach single-digit body fat. “It can often lead to you feeling burned out, tired, and irritable,” Finn says.

That’s why cardio exercise, for lifters, is a lot like the 2016 presidential election. You have to decide which is the lesser of two unattractive choices. But unlike the election, one of those cardio options—low-intensity, steady state walking or cycling—is clearly better than the other.

“Three to five hours of lower-intensity cardio, spread across four to five weekly sessions, is usually enough to get the job done,” Finn says. But if you can do less and still get the results you want, you should.

Now we get to perhaps the biggest irony of physique training: Those abs you see on the leanest guys may have been started in the gym. They may have been enhanced in the kitchen, mostly by staying out of it.

But they were finished on the treadmill. Which could be the least motivational cliché of all time.

This story was originally published on MensHealth.com

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