Caffeine timing: when to take it before training and racing
Most people get caffeine timing wrong. They neck a coffee on the way to the gym, start the warm-up ten minutes later and wonder why the kick turns up somewhere around the cool-down.
Caffeine works. It's one of the few legal performance aids with a mountain of evidence behind it. The dose and the timing decide whether you feel it during the session or after it. Get your caffeine timing right before a workout and the same dose does more.
How caffeine actually reaches your muscles
Once you swallow caffeine, it has to clear your stomach, get into your bloodstream and circulate before it does anything. Blood levels usually peak 30-90 minutes after you take it, depending on the format and what else is in your gut.
The International Society of Sports Nutrition position stand on caffeine recommends 3-6mg per kilo of body weight, taken about 60 minutes before exercise, to improve endurance and high-intensity performance (Guest et al., 2021).
For an 80kg athlete, that's roughly 240-480mg. Most people sit at the lower end and feel plenty. Past a certain point, extra caffeine just gives you the jitters and a racing heart with no extra performance.
The timing that works
Take it about 45-60 minutes before the hard part of your session. Time it to the main set and ignore the warm-up.
If you're racing, count back from your start time. Plan the dose so blood caffeine peaks as your wave goes off, while you're on the start line and done queuing.
The format changes the maths. A liquid clears your stomach faster than a capsule or a bar, so it tends to come on sooner and more predictably. That's part of why we made Pre-Shot a 60ml ready-to-drink shot. You get a measured 200mg of caffeine with nothing to scoop or mix, so the timing is easy to get right.
Caffeine for Hyrox and hybrid races
Hybrid racing is a long event with repeated high-intensity spikes, and caffeine helps with both. It lowers how hard the effort feels, which keeps the run splits manageable, and it supports power on the stations.
The catch is the start time. Hyrox waves can run from early morning to mid-afternoon, and your slot might move on the day. Have a plan for an 8am start and a plan for a 1pm start, and dose for whichever you actually get. A liquid shot makes that easy because you can take it on a known clock right before you go. We cover what to check on a Hyrox shot in a separate guide.
The mistakes that cost you
Too late. This is the most common one. Caffeine taken five minutes before the warm-up has barely started working by the time you need it.
Too much. Doubling the dose gets you a pounding heart and a stomach that turns on you mid-race, with no extra benefit.
Too close to bedtime. Caffeine has a half-life of around five to six hours, so about half of a 6pm dose is still in your system near midnight. After an evening session that hits your sleep, and sleep does more for your performance than the caffeine did. If you train late, keep the dose small or skip it.
No plan for tolerance. Drink coffee all day and your pre-workout caffeine lands on a system that's already used to it. If you want it to count for training, keep your background intake honest.
Food, fasted, and what to take it with
Caffeine works fasted or fed. On an empty stomach it tends to hit faster and harder, which some people love and others find rough on the gut. If you train first thing and have a sensitive stomach, a little carbohydrate alongside it can take the edge off and still let the caffeine work.
For longer sessions and races, pairing caffeine with carbs is the standard move anyway. The caffeine sharpens focus and lowers perceived effort, and the carbs keep the tank topped up. They do different jobs and work well together.
Tolerance, and how to keep caffeine working
The more you lean on caffeine, the less it does. Drink it all day, every day, and the performance boost shrinks because your body adapts.
You can keep drinking coffee. Just be deliberate about it. Keep your everyday intake modest and treat a proper pre-session or pre-race dose as something separate. Some athletes cut back for a few days before a key race so the race-day dose lands cleaner. Try it in training to see if it does anything for you.
A simple protocol
Start at 3mg per kilo. Take it 45-60 minutes before the hard work. Use a format you can time reliably. Keep your last dose of the day at least six hours before bed.
Test it in training before race day. You want to find out in a Tuesday session if caffeine on an empty stomach disagrees with you.
If you want to see how ready-to-drink compares with powders for endurance work, we put them side by side here: pre-workout powders for endurance, compared. If you're choosing a format from scratch, we ranked the best pre-workout formats in the UK by evidence.
The point
Caffeine is one of the most reliable tools you have. The dose is well established and the timing is simple. Take a sensible amount, take it an hour out and let it peak when you need it.
Get those two things right and you're ahead of most of the field, who are still drinking their coffee in the car park.
Pre-Shot is £10.99 for a 6-pack. Meet Pre-Shot.