Walk down the supplement aisle and you'll find hundreds of pre-workouts, gels, and energy chews with ingredient lists that read like a chemistry exam. Look closely and nearly all of them lean on the same active ingredient: caffeine.
There's a reason for that. Caffeine is one of the most thoroughly studied performance aids in sport, and unlike most of what's on that shelf, it reliably works. The cleanest way to get it? Coffee.
What caffeine actually does for endurance performance
It makes hard efforts feel easier
Caffeine blocks adenosine, the molecule that builds up in your brain and signals fatigue. The practical result is a lower rate of perceived exertion (RPE): the same pace feels less brutal, so you can hold it longer or push harder before your brain tells you to back off. It also dulls the perception of muscle pain during sustained efforts, which is a big part of why caffeine shows up in so many headache medications.
It improves time-to-exhaustion and time-trial results
Across dozens of studies, moderate caffeine doses improve endurance performance by a few percent on average. That doesn't sound like much until you do the math on a 40K bike split or a half marathon, where a few percent can mean minutes. The International Society of Sports Nutrition's position stand puts the effective range at roughly 3–6 mg of caffeine per kilogram of body weight, taken about 60 minutes before exercise.
It may help you refuel after
One of the more interesting findings for multi-day events: when caffeine is taken alongside carbohydrates after exhaustive exercise, some research shows faster muscle glycogen replenishment than carbs alone. If you're racing or training hard on back-to-back days, that matters.
How much is that in coffee?
For a 165 lb (75 kg) athlete, 3–6 mg/kg works out to roughly 225–450 mg of caffeine. A typical 12 oz cup of brewed coffee lands somewhere around 150–250 mg depending on the bean, roast, and brew strength. So one to two solid cups covers most people.
Start at the low end. More isn't better past a point: high doses bring jitters, a racing heart, and the GI distress no one wants at mile 10. And never try a new caffeine strategy for the first time on race day. Test it in training.
Why coffee instead of a pre-workout
Simple: you know exactly what's in it. Coffee is caffeine plus naturally occurring compounds people have been drinking for centuries, with no proprietary blends, no artificial sweeteners, and no ingredients you can't pronounce. As a roaster, that's the whole philosophy behind GRND: real coffee, roasted fresh, built for people who train.
A race-day caffeine timeline
Caffeine levels in your blood peak roughly 30–60 minutes after you drink it, with effects lasting several hours. Here's a simple framework for a morning race:
- 90 minutes out: Wake up, drink your coffee with a light, familiar breakfast. This leaves time for digestion and a bathroom stop before the start.
- 30–45 minutes out: Start your warm-up. Caffeine is ramping up right as you begin to move.
- Start gun: You're near peak levels with the warm-up done.
- Long events (3+ hours): Consider a small top-up mid-race through a caffeinated gel or cola, practiced in training first.
For race morning we reach for CHARGE, our highest-caffeine roast, built specifically for the days you need to go deep into the red.
Multi-day events: think about tomorrow
Stage races, two-day triathlon formats, and tournament weekends add a wrinkle: sleep. Caffeine's half-life is around five hours, so a big afternoon dose can still be in your system at bedtime, and poor sleep wrecks recovery faster than anything. Use caffeine strategically in the morning and around competition, then taper off by early afternoon so you can actually rest for day two. For a gentler morning cup on easy or recovery days, RISE is our everyday go-to.
The GRND Recovery Cold Brew
Between sessions, this is the cold brew we make. The fat from the MCT oil and cream adds staying power, and you can blend in a scoop of protein to make it a true recovery drink.
You'll need:
- 8 oz cold brew concentrate, diluted to taste (made from coarsely ground GRND coffee)
- 1 tbsp MCT oil (start with 1 tsp if you're new to it, since MCT can upset your stomach)
- 1–2 tbsp heavy whipping cream
- Optional: 1 scoop of your preferred protein powder
- Ice
To make it: Add everything except the ice to a blender and blend for 15–20 seconds until frothy. Pour over ice and drink within an hour or two of your session, alongside your normal post-workout meal and fluids.
Making the cold brew: Combine 1 cup of coarsely ground coffee with 4 cups of cold water, stir, and steep in the fridge for 12–18 hours. Strain through a fine mesh strainer or coffee filter. It keeps in the fridge for up to a week.
The bottom line
Caffeine is one of the few performance aids with real science behind it, and coffee is the most honest way to get it. Dial in your dose, time it about an hour before the start, practice it in training, and protect your sleep when you're racing on back-to-back days.
This article is for general educational purposes and isn't medical advice. If you're pregnant, have a heart condition, take medications, or are sensitive to caffeine, talk to your doctor before changing your caffeine intake.