Gymnast Hydration: When Water Isn’t Enough at Practice

Gymnast hydration seems simple: drink water, right? Here’s the thing: for a gymnast training 3, 4 or 5+ hours at a time, water alone usually isn’t enough. Somewhere around the second hour, she needs more than just fluid to keep her muscles, brain and skills working the way they did at the start of practice.

Let’s talk about why hydration matters so much in this sport, how much your gymnast should drink, when water stops being enough, the signs she’s dehydrated and how to build a simple hydration plan.

By Christina Anderson MS, RDN, CSP, CSSD · Updated October 2026

Why gymnast hydration matters

Muscles are about 75% water. A dehydrated muscle doesn’t have the same pliability, which matters a LOT in a sport that demands supple muscles and flexible joints. Fluid also lubricates the joints and is how nutrients, oxygen and waste products travel through her blood to and from her cells.

And it doesn’t take much. Losing as little as 2% of body weight through sweat can hurt performance, focus and motor control, and makes practice feel harder than it actually is. For a 40 kg (88 lb) gymnast, that’s less than 2 pounds of sweat.

Do gymnasts really sweat?

Yes! I’ve heard it said in the gymnastics world that “gymnasts don’t sweat and only need water, never a sports drink.” That couldn’t be farther from the truth. A 4-hour optional practice is long, intense work, and plenty of gyms aren’t air conditioned (or aren’t as cool as you keep your house).

You may have heard that kids can’t handle heat as well as adults. Newer research says that when kids are properly hydrated, they handle exercise in the heat about as well as adults do. The biggest risk factors are the ones we can control: poor hydration, pushing too hard and not enough recovery between sessions. That’s good news, because it means hydration is something we can actually fix.

How much water should a gymnast drink?

There’s no single number, because it depends on her size, training hours, the gym’s temperature and how much she sweats. But here’s how I think about it.

Her daily baseline

Before practice even enters the picture, her body needs a baseline amount of fluid every day. When I worked in the hospital as a pediatric clinical dietitian, we used a standard formula for kids’ maintenance fluid needs. For a 40 kg (88 lb) gymnast, that works out to roughly 1.9 liters (about 64 oz) a day, BEFORE adding what she loses at practice. Bigger gymnasts and hot gyms mean more.

Before practice

The goal is to walk into the gym already hydrated. The American College of Sports Medicine suggests drinking about 5-7 ml per kg of body weight at least 4 hours before exercise. For that same 40 kg gymnast, that’s about 1 cup. A pre-practice meal or snack with carbs and a little salt helps her hold onto that fluid.

During practice

Most gyms let gymnasts “drink when thirsty.” That doesn’t work well for kids. They’re focused, having fun, waiting for their turn and don’t want to lose their spot in line, so they ignore thirst. A better plan is small, regular sips at every rotation.

Don’t overdo it

More isn’t always better. Urine doesn’t need to be clear, and young athletes shouldn’t be drinking gallons a day. Drinking way too much plain water can dilute the sodium in her blood (hyponatremia), which is dangerous. This is another reason a hydration plan beats guessing.

All fluids count

Water, milk, juice, tea, coffee, smoothies and sports drinks are all mostly water, and they all count toward her fluid needs. Fruits and veggies are about 70% water too. They’re helpful (especially for a gymnast who doesn’t love plain water) but not enough on their own.

Is caffeine dehydrating?

Not the way most people think. In a review of the research, normal servings of coffee, tea and soda didn’t cause extra fluid loss, especially in people who drink them regularly.

That said, caffeine isn’t something I want young gymnasts relying on. The American Academy of Pediatrics recommends no more than about 100 mg a day for teens 12-17, and an 8 oz Starbucks brewed coffee has about 180 mg. Energy drinks are the biggest culprit, often 150 mg or more per can. Energy should come from food, not caffeine. For older gymnasts, a morning latte within those limits is fine (and a great way to fit in some calcium and vitamin D).

What’s in sweat?

Sweat isn’t just water. It’s mostly sodium and chloride, with some potassium and small amounts of magnesium and calcium, which help with nerve and muscle function. One liter of sweat has roughly:

• 460 mg sodium (about 1/4 tsp of salt)
• 710 mg chloride
• 160 mg potassium
• Up to 36 mg magnesium and 120 mg calcium

The goal of hydration is to replace what her body has lost. That’s why some “natural” options fall short on their own. Coconut water, for example, has about 50 mg of sodium and 940 mg of potassium per 16 oz, which doesn’t match what she’s losing in sweat.

Why water isn’t enough after the first 1.5-2 hours

If she had a good pre-practice meal or snack with carbs and sodium, water is usually fine for the first 1-2 hours. After that, two things change.

1. She’s running low on fuel. Gymnastics is a high-intensity sport that runs mostly on carbs. For practices of 3.5 hours or more, she should start getting carbs about 1.5-2 hours in. Depending on how hard the practice is, a gymnast may use about 10-30 g of carbs an hour, and upwards of 60 g in a really intense hour.
2. Water alone doesn’t absorb as well. Sodium and sugar work together to pull water across the gut into her bloodstream. Think of them as little bridges in the wall of the small intestine. When she’s sweating a lot, water needs that sodium and sugar to get where it needs to go.

That’s exactly why Gatorade was invented: for University of Florida football players practicing for hours in the Florida heat. A true sports drink is a 6-8% carb solution with sodium and potassium, which is enough carbs to fuel her without upsetting her stomach.

What can she use?

• A sports drink
• Quick, low-fiber snacks (fruit snacks, pretzels, dried fruit) with water
• An electrolyte drink plus carbs from juice or snacks

Not every product on the shelf qualifies. Some have no sodium, some have no carbs, and some are oral rehydration solutions meant for illness. For a full breakdown of Gatorade, Prime, Body Armor, Liquid IV and more, see Do Gymnasts Need Sports Drinks? And for food ideas, see The Best Snacks for Competitive Gymnasts.

“But isn’t that too much sugar?”

This is the most common pushback I hear. A lot of gyms and parents think liquid sugar at practice is “toxic” and only want gymnasts to have water or fruit. Here’s the thing: during hard training, her body doesn’t care whether the sugar came from an apple or a sports drink. It needs carbs to keep going. “Natural” doesn’t automatically mean better for performance.

Context matters. A sedentary kid drinking juice, soda and flavored milk all day is very different from a gymnast using carbs strategically halfway through a 4-hour practice. As a former certified diabetes educator, I can tell you that using carbs during practice isn’t going to cause weight gain or diabetes. We’re simply replacing what her body is burning. And I will never tell a high-level gymnast to train for 4+ hours on water alone.

Signs your gymnast is dehydrated

Dehydration can be hard to spot in young athletes, and many gymnasts just think practice is supposed to feel this hard. Watch for:

• Dark urine. Her first pee after practice should be no darker than lemonade. If it’s darker, she spent most of practice dehydrated.
• Barely using the bathroom. Going 4-5 hours without peeing (or only once) is a red flag.
• Headaches, especially toward the end of practice or in the summer
• Nausea or vomiting during or after practice
• Muscle cramps (they can have other causes too, but hydration is the first thing to rule out)
• Fatigue and lack of focus, falling apart by the third event, or a practice that feels way harder than it should

When I was a high-level gymnast, there were so many nights I’d get a horrible headache toward the end of practice, especially in the summer. I’d come home, skip my shower and dinner, and go straight to bed with the lights off. I thought it was some kind of migraine. Not until I became a dietitian did I realize it was most likely dehydration and underfueling.

Throwing up is NOT a badge of honor

Sometimes workouts are so intense that athletes vomit. That isn’t a normal part of the sport. Often, better fueling and hydration help. And nausea, vomiting, confusion or a headache in a hot gym can also be signs of heat illness, which needs attention right away.

“She’s just not trying hard enough”

A lot of fatigue, sloppiness and lack of focus during a 3-6 hour practice gets blamed on effort or attitude. Very often, there’s dehydration and underfueling layered on top of a hard sport. Perfectionist gymnasts tend to push through and assume they just need to try harder, which leads to overtraining, overuse injuries and burnout.

Why gymnasts don’t drink enough

• They don’t want to use the bathroom during practice
• They’re worried about looking “bloated.” A little belly after eating and drinking is just food and fluid in the stomach. It has nothing to do with body fat, and comments from coaches, teammates or parents about looking “fat” or “bloated” can scar a gymnast and keep her from fueling and hydrating.
• They’re focused and ignore thirst
• Disordered eating. Restricting, or bingeing and purging, can lead to dangerous fluid and electrolyte imbalances, especially in a 4+ hour practice. If your gymnast refuses to eat or drink before practice, she shouldn’t be training at that intensity.

Can we please normalize bathroom breaks and a full belly at practice?

Rehydrating after practice

Gymnast hydration doesn’t end when practice does. After practice, she needs to replace the fluid, sodium and carbs she lost, especially before a two-a-day or another long practice tomorrow.

Chocolate milk is a great option: an 8 oz glass has about 30 g of carbs and 8 g of protein, plus fluid, calcium and some electrolytes. A salty snack or a real meal with plenty of fluids works too. Then check: is her urine back to lemonade or lighter? (More on what to eat after practice in The Must Know for Gymnast Recovery Nutrition.)

Build a gymnast hydration plan

Every gymnast’s needs are different: her age, size, training schedule, how hard and long practices are, the climate, her gym and her sweat rate all matter. That’s why I recommend a hydration plan instead of guessing. A simple one looks like this:

1. All day: drink regularly toward her daily baseline, and use salt in everyday cooking. Many families eating “clean” undersalt, and athletes need more sodium than the general population.
2. Before practice: a meal or snack with carbs and a little salt, plus about a cup of fluid.
3. First 1-2 hours: water, small sips at every rotation.
4. After 1.5-2 hours: add carbs and sodium (sports drink, snacks plus water, or electrolytes plus carbs).
5. After practice: fluids, carbs, protein and salt, and a quick urine color check.

None of this works if she isn’t eating enough overall. No amount of Gatorade can make up for an underfueled gymnast.

Frequently asked questions

Get help for your gymnast

Gymnast hydration is one of the easiest performance wins in this sport, and one of the most overlooked. Small changes can mean better energy, better focus and fewer headaches by the last event.

Not sure if your gymnast is fueling and hydrating enough? Start with the free Underfueled Gymnast Check. And if you want more than a generic meal plan, The Balanced Gymnast® Program is our 1:1 program, built by a former gymnast, nationally rated NCAA/USAG judge and pediatric sports dietitian who lives and breathes this sport. We build her plan around HER: her training schedule, her gym, her sweat and the foods and drinks she actually likes, so she can close the recovery gap each and every day.