The right snack before interval running can make the difference between completing your intervals with good quality and feeling heavy along the way, getting stomach discomfort, or having to cut the workout short. Hard intervals typically require a bit more planning around energy intake than an easy jog, but it doesn’t have to be complicated.
Here’s a practical guide to what you can eat 30–60 minutes before interval running, how much typically makes sense, and how to fuel your body with consideration for your stomach.
Why your pre-interval snack makes a difference
Intervals stress both heart rate, pace, and muscles, and the energy largely comes from carbohydrates. If you’ve eaten lightly during the day or it’s been a long time since your last meal, you may experience challenges during training.
- Running out of energy mid-session
- Slowing down because your legs feel heavy
- The quality of the last intervals dropping
A small, well-thought-out snack with easily digestible carbohydrates can help you maintain intensity throughout the session. Many runners choose a small snack meal 30–60 minutes before, especially if it’s been 2–3 hours since the last proper meal.
If you want to work more systematically with your fueling plan, you can find inspiration in PurePower’s own fuel guides for running.
Timing your snack before intervals
How close to the run you can eat depends, among other things, on the amount, intensity, and your stomach. As a rule of thumb, you can use the following guideline.
- 60 minutes before: There’s typically room for a small but more “real” snack here, for example an energy bar, banana, or toast. It can give your stomach time to settle before the pace increases.
- 30 minutes before: Keep volume down and focus on lighter carbohydrates. Choose a smaller amount, for example half a bar, a smaller Energy Snack before intervals or a bit of sports drink.
- 15 minutes before: Here some choose fast carbohydrates that don’t take up much space in the stomach, for example an energy drink or a small gel. This can be relevant if you’re short on time but would like to top up your energy intake.
Many find that it works well to eat the last main meal about 2–3 hours before and supplement with a small snack about 30–60 minutes before the intervals.
How to put together a stomach-friendly snack
When you’re running hard intervals, your stomach often plays a big role in what works. A simple rule of thumb is to choose mostly carbohydrates and limit amounts of fat, fiber, and protein close to training.
- Lots of carbohydrate
- Little fat
- Little fiber
- Little protein
In practice, that typically means the following choices.
- Yes please to banana, white bread with a little jam, rice cakes, simple grain products, energy bars, and drinks developed for sport
- Be cautious with whole grains, large amounts of nuts, fatty cheese, meat, and large amounts of yogurt or kefir right before training
A solution many endurance athletes typically use is a soft and easy-to-eat energy bar about 30–60 minutes before. PurePower’s Energy Snack before intervals is based on oats and glucose syrup and developed to be easy to consume and as a practical source of carbohydrates before training.
If you have a sensitive stomach, you can benefit from adjusting your plan around the intervals.
- Place the biggest and most fiber-rich meals about 3–4 hours before
- Test your snack on easy sessions before using it for hard intervals
- Cut back on whole grains, cabbage, beans, and very fatty foods in the last 24 hours before important interval sessions
Bar, gel, or energy drink for interval running
The choice of snack type depends on how hard and how long you train, and what you prefer when your heart rate is high. The different solutions each have their own use.
Bar or snack before and during the warm-up
A bar can be a practical snack 30–60 minutes before, when you have time to chew and get something in your stomach. A smaller bar like a small, fresh Energy Snack before the run can also work if you only have a short time and don’t want to run completely fasted.
Gel when you can’t chew at high heart rate
During the intervals themselves, many find it can be difficult to chew. Here, an energy gel if you can’t chew at high heart rate may be easier to consume between intervals or just before the last set. The gel contains carbohydrates and is available both with and without caffeine.
Energy drink or chews as liquid or small snacks
If you’re not hungry but want to supplement with energy, liquid carbohydrates or small gummies can be an alternative. Some choose energy chews as an alternative to a bar because they’re easy to dose in small bites and can be easy to chew, even when your heart rate is high.
You can use a simple guideline when you plan your snack strategy.
- Use snacks and bars before and possibly during the warm-up
- Use gels, drinks, or chews if you want to supplement during longer or very hard sessions
Three practical ways to eat before intervals
Below you’ll find three typical scenarios that you can use as a starting point and adapt to your own everyday life and stomach.
1. Early morning with interval running
You get up, need to run in 30–45 minutes, and don’t have the appetite for a big meal. Here it can be about giving your body a bit of energy without overfilling your stomach.
- A small glass of juice or half a smoothie
- Optionally half a banana or half a small energy bar
- A glass of water
Some also choose to run shorter morning intervals fasted if they’ve tested it and do well with it. For longer and very hard sessions, however, many will typically benefit from consuming carbohydrates in some form.
2. Intervals in the evening after work
You ate lunch around 12–13 and need to run intervals at 17–18. Here it can make sense to think in both a between-meal and a snack.
- At 15–16: A carbohydrate-rich between-meal, for example porridge, a pasta or rice dish, or bread
- At 16.30–17.15: A snack 30–60 minutes before, for example:
- A banana and one to two rice cakes with jam
- An Energy Snack before intervals
- A smaller bar and a little water
That way, you show up to run neither hungry nor overly full, but with energy stores better supported for the session.
3. When you’re running late before training
You’re about to head out the door, training starts in 20–30 minutes, and you haven’t eaten enough. Here it can make sense to choose solutions that are easy to consume and quickly available.
- A glass of sports drink or juice
- Optionally a couple of small energy chews as an alternative to a bar or half a gel
- A little water in small sips
Pay extra attention not to consume large amounts of food or fluid right before the start. For many, a smaller amount of quickly available energy works better than starting with a heavy feeling in the stomach.
Fluids and electrolytes in connection with intervals
Even on shorter interval runs, hydration status can matter, especially if you train in warm conditions, sweat a lot, or combine intervals with a longer warm-up and cool-down jog. Both fluids and salts play a role here.
A rule of thumb many use is about 500 milliliters of fluid 1.5–2 hours before training and then small sips closer to the start. On longer sessions or in high heat, some choose to supplement with electrolytes, which can help support fluid balance.
If you want to understand more about what electrolytes mean for performance and fluid balance, you can dive into the article about what electrolytes do for performance and fluid balance.
If you want a simple option to support fluid and electrolyte balance before or during training, consider electrolytes for hydration during intervals.
Find your own routine before interval running
The ideal snack before interval running is individual, and it may take a bit of trial and error to find the solution that fits your body and your training. Use your training sessions to test different snacks, timing, and amounts.
Feel free to write down what you eat, when you eat it, and how both your stomach and legs respond during the intervals. That way, you can find a routine that helps you complete the session with good quality and an appropriate energy intake for the last interval.