Few factors affect athletic performance as much as hydration. Even relatively small amounts of fluid loss can affect endurance, strength, concentration, and your ability to regulate body temperature.

A dehydration state is commonly discussed in terms of body-weight loss from fluid. Once fluid losses become significant, athletic performance can suffer. The problem is that thirst is not always an early warning system. By the time you feel particularly thirsty, you may already be behind on your fluid intake.

Hydration is a habit, and habits are learned.

The best time to develop a hydration strategy is during training—not on race day. Before a long ride, run, or triathlon, you should know how much fluid you are carrying, where you will get additional fluids, and how you will drink while maintaining your pace and technique.

Here are some practical strategies for improving hydration during cycling and running.

Drinking on the Bike

Drinking while cycling requires a certain level of skill, particularly for newer cyclists. Reaching for a bottle, removing it from the cage, drinking, and returning it to the cage should eventually become a smooth and nearly automatic process.

A good place to learn is on a stationary trainer. Practice removing your water bottle and drinking while keeping your eyes forward. Once you are comfortable with the movement, practice it outside in a safe environment until you can drink without compromising your bike handling.

Water Bottles and Hydration Bladders

A hydration bladder can be another effective option for staying hydrated on longer rides. Although traditional cycling bottles remain more common, hydration bladders have several advantages.

They can hold a relatively large amount of fluid, which means fewer stops for refills. Some riders also find that the insulation of a hydration pack helps keep the fluid cool. The pack itself can provide some cooling against your back, particularly on a hot day.

Another advantage is accessibility. Because you can drink through a hose without removing a bottle from the bike, some athletes find that they drink more consistently with a hydration bladder.

The downside is that hydration packs take some getting used to. You need to become comfortable wearing the pack, managing the hose, and making sure the system does not interfere with your cycling position.

Bike-Mounted Hydration Systems

Triathletes also have numerous hydration systems designed specifically for use on the bike. These include frame-mounted bottles, aerodynamic bottles, and fluid reservoirs positioned between or behind the aerobars.

The advantage is the same: convenient access to fluids and fewer interruptions during long training sessions and races.

Whatever system you choose, remember that simply carrying enough fluid does not guarantee that you will drink enough.

A useful strategy is to create a reminder system. For example, you might set your watch to alert you every 15 minutes and use the reminder as a cue to drink. The exact amount you need will depend on factors such as body size, temperature, humidity, exercise intensity, sweat rate, and individual tolerance.

The important point is consistency.

Don't wait until you are thirsty to start thinking about hydration.

Drinking on the Run

Hydration during a long run presents a different set of challenges. Unlike cycling, there is no convenient bottle cage directly in front of you, and carrying a bottle can affect both comfort and running mechanics.

There are several options, and the best choice depends on the distance, weather, course, and your personal preference.

Handheld Running Bottles

A handheld bottle can be a simple solution for shorter runs. Some systems use a soft flask with an adjustable strap that wraps around your hand.

The advantage is convenience. The bottle is readily available and does not require a belt or backpack.

The downside is that carrying something in one hand can become uncomfortable over a long period of time. Some runners also dislike the feeling of having additional weight in one hand or worry about how it affects their running mechanics.

For competitive runners, there may also be concerns about anything that changes their normal arm movement.

Hydration Waist Packs

A waist pack can provide another convenient option. These systems typically use one or more bottles positioned around the waist.

A soft-sided hydration reservoir with a belt and drinking tube can also be used for longer runs. These systems provide greater fluid capacity, but they can feel heavier and may bounce or move if they are not properly fitted.

Over very long distances, friction from a poorly fitting pack can also lead to irritation or blisters.

As with any piece of equipment, fit matters.

Single-Bottle Running Belts

A single-bottle waist pack can be a good compromise between carrying enough fluid and minimizing weight.

There are numerous designs. Some position the bottle horizontally, while others angle the bottle to make it easier to reach. Horizontal bottles can provide good stability, while angled bottles may be easier to access but can sometimes have a greater tendency to move or fall out.

Look for systems with adjustable elastic or retention straps that keep the bottle securely in place.

A hydration system that bounces every time you run is not going to encourage you to drink consistently.

Multiple-Bottle Hydration Belts

Multiple-bottle hydration belts are another popular option for longer runs. These systems typically distribute several small bottles around the waist rather than placing all of the fluid in one large container.

The smaller bottles are relatively light, and the wider waistband can help distribute the weight more comfortably.

Another advantage is flexibility. You can use different bottles for different purposes—for example, water in one bottle, sports drink in another, and carbohydrate or other fueling products in a third.

The disadvantage is that you may occasionally notice the bottles while running, particularly if the belt is not adjusted correctly.

The goal is to find a system that becomes almost unnoticeable once you are running.

Practice Your Hydration Strategy Before Race Day

Whatever hydration system you choose, practice with it during training.

This is especially important for triathletes and endurance athletes preparing for long events. A hydration system that looks great in the store may not work well after two or three hours of running or cycling.

Test the equipment. Test the fit. Test how easy it is to access your fluids while moving.

Most importantly, determine whether the system actually encourages you to drink consistently.

Never introduce a completely new hydration method on race day.

Your hydration equipment should be something you have already used repeatedly in training and know you can operate without interrupting your pace, technique, or concentration.

Make Hydration Part of Your Training Strategy

Good hydration is not simply a matter of carrying a water bottle. It is part of your overall endurance-training strategy.

Determine what works for you during different types of workouts and in different environmental conditions. Pay attention to how much you drink, how you feel during and after training, and how your hydration needs change with temperature, humidity, duration, and intensity.

The best hydration system is ultimately the one you will actually use.

Whether that means a traditional cycling bottle, hydration bladder, bike-mounted reservoir, handheld running bottle, or waist belt, find a system that allows you to drink consistently without interfering with your performance.

Hydration is a habit.

Build that habit in training, and it will be there when you need it on race day.

Matt Russ enjoyed a professional coaching career spanning over two decades of working with professional endurance athletes. His athletes have achieved numerous regional, national, international and championship titles under his direction. Matt achieved the highest level of licensing by both USA Triathlon and USA Cycling, and was a licensed USA Track and Field Coach. His accomplishments include being named "Team USA" Coach for the 2011 Beijing World Championship. Head Coach and founder of The Sport Factory, a USA Triathlon Certified Performance Center, he has authored many articles on a wide variety of endurance related topics.