Olympic-level swimmers burn around 3,000-10,000 calories a day, depending on the intensity of their workouts. No surprise then, that the likes of Lochte and Phelps consume about 7-8,000 calories a day—four times the average adult male’s diet.
Why is swimming so energy-intensive? In terms of calories burned, it’s about the same as cycling or running. The average swimmer will probably burn 400-600 calories in an hour-long swim. The difference is the water, which provides resistance that is about 12 times greater than air.
Swimming is also a whole body workout, making use of all four limbs moving at the same time, through dense liquid. Pro swimmers can achieve power physicists estimate at a maximum of 1,200 watts—three times that of a cyclist.
Moreover, the body loses a lot of heat to the surrounding pool and has to expend a greater amount of energy on temperature regulation. There’s also a theory that submerging the body in temperatures below 20ºC (68ºF) triggers hunger, releasing hormones that signal for the body to store more fat for insulation. No wonder, then, that swimmers need and want a lot of fuel.
This can be a problem when swimmers retire. Phelps, now 31, reportedly put on 25 pounds after the 2008 Beijing Games, and says his calorie intake has dropped considerably, partly because of lifestyle and training changes after rehab for alcohol abuse, but also because, sadly, he no longer has the body and metabolism of a 23-year-old.
Look around a high-level strength competition like the World’s Strongest Man or the annual Arnold Classic and you’ll see some abs, but you’ll also definitely see some bellies. The same goes for the super heavyweight divisions of powerlifting and Olympic weightlifting competitions. When it comes to pure strength, people with lots of mass typically win out over super-cut bodybuilder types— and the reasons get a bit complicated.
"Strongman training sessions are typically three to four hours long," says Rick Howard, the northeast regional coordinator for the National Strength and Conditioning Association and strongman competitor. "Strength athletes eat while they train because they learn their bodies. They can feel when they're running out of energy."
Even though the workouts typically don’t involve much—if any—dedicated cardio time, lifting weights can burn hundreds or even thousands of calories. The body needs a surplus of calories to build muscle, so eating is part of the routine. High-level competitors like World’s Strongest Man champions Brian Shaw or Eddie Hall typically refer to their eating as “force feedings.”
The result of heavy training and heavier eating is more muscle mass, which competitors use to create more leverage against the bar or whatever other apparatus they may be trying to manipulate.
Physically big competitors have given their bodies more time to adapt to the stresses of heavyweight. During heavy lifts, athletes often wear tight lifting belts around their abdomen to reinforce their bodies’ midline, which includes the abs and lower back. The extra mass packed into a tight belt helps build a sturdy column for holding up seemingly absurd weights.
Building that kind of mass requires lots and lots of food, and not all of it can be “clean,” if you’re going for pure volume and caloric intake. Cutting the excess fat from the bulking process would take precious muscle with it, which is a cost most competitors aren’t willing to pay for looks, or even their own long-term health.
Gymnasts like Biles and Aly Raisman launch themselves into the air and then flip and twist two or even three times before coming down to Earth.
But despite those amazing feats of prowess, these athletes aren't usually chowing down at the dinner table. Gymnasts benefit from tiny, muscular frames to generate the explosive power of a full-twisting double layout or an Amanar vault, but every extra ounce of body weight also makes it harder to get airborne, former Junior Olympic gymnast and nutrition coach Gina Paulhus told Bodybuilding.com.
What's more, although their routines involve explosive bursts of energy for a minute or two, there's also a lot of standing around waiting for their turn on the equipment, both during training and during meets. For instance, a 4-hour gymnastics workout burns just 1,000 calories, far less than the 2,400 calories burned during a brisk, 4-hour jog, according to Harvard Medical School.
As a result, gymnasts have earned a reputation for having highly restrictive diets, and for sometimes struggling with eating disorders.
"It's tough when you're in a sport that is judged on appearance," Clark said. "And many of those gymnasts are in bodies that it takes a lot of effort to keep."
For instance, former gymnast Dominique Moceanu told The New Yorker that former coaches Bela and Marta Karolyi put her on a diet of 900 calories a day. Biles seems to have fewer restrictions, eating foods such as pork chops, chicken sandwiches and even the occasional soft drink, according to that article.
The ideal diet for a gymnast is one that contains at least 2,000 calories and is low in fat, high in complex carbohydrates and high in fiber, according to USA Gymnastics. In other words, to power those gravity-defying tumbling passes, Biles probably isn't eating much more than you or I.
Wondering how lockdown has affected Premier League Footballers nutrition? See the below link;