The most important things to do before a workout are eat the right foods at the right time, warm up your body with movement, hydrate, and get your mind focused. How much each of these matters depends on when you’re training, how intense the session will be, and what you ate earlier in the day. Here’s how to set yourself up for a better workout from start to finish.
Time Your Pre-Workout Meal
The single biggest factor in pre-workout nutrition isn’t what you eat, it’s when you eat it relative to how much you’re consuming. A large meal needs two to three hours to clear your stomach enough to exercise comfortably. A smaller snack can work with as little as 15 to 60 minutes of lead time.
Performance research consistently shows that eating carbohydrates before exercise improves endurance. In one study, cyclists who consumed a carb-rich meal three hours before riding lasted 237 minutes compared to 201 minutes on an empty stomach. Even a modest amount of carbs eaten 15 to 60 minutes beforehand has been shown to extend time to exhaustion during running and cycling. The sweet spot for most people is about 1 gram of carbohydrate per kilogram of body weight (roughly 0.5 grams per pound). For a 150-pound person, that’s around 70 grams of carbs, the equivalent of a banana with a cup of oatmeal.
If you have two to three hours before your workout, you can eat a full meal with carbs, protein, and some fat. Think rice with chicken and vegetables, or a sandwich. If you only have 30 to 60 minutes, keep it simple: a piece of fruit, a handful of pretzels, toast with jam, or a small bowl of cereal.
What to Avoid Eating Beforehand
Foods high in fiber, fat, and protein slow digestion and increase the risk of stomach cramps, bloating, nausea, and other gastrointestinal problems during exercise. A bean burrito or a big salad right before training is a recipe for discomfort. Dairy products can also cause issues, even if you don’t normally consider yourself lactose intolerant. Mild sensitivities that go unnoticed at rest can flare up when your body redirects blood flow away from your gut and toward your muscles.
High-fructose drinks (especially those sweetened exclusively with fructose rather than a mix of sugars) and very concentrated carbohydrate solutions can also trigger GI distress. If you’re using a sports drink, stick to standard formulations rather than loading up on extra-sweet options. For important training days or races, avoid high-fiber foods for a full 24 hours beforehand.
Early Morning Workouts and Fasted Training
If you exercise first thing in the morning, you may not have time (or the appetite) for a full meal. The good news: for shorter sessions under about 60 minutes, exercising on an empty stomach doesn’t meaningfully hurt performance. A meta-analysis comparing fasted and fed exercise found that eating beforehand improved prolonged aerobic performance but made no significant difference for shorter bouts.
Fasted training does increase the amount of free fatty acids circulating in your blood afterward, and there’s early evidence it may trigger beneficial metabolic adaptations in muscle and fat tissue. If your session is a quick 30- to 45-minute strength workout or moderate cardio, training fasted is perfectly fine. For longer endurance sessions, eating something small, even just a banana or a few crackers, will help you sustain your effort.
Hydrate Before You Start
Starting a workout even mildly dehydrated reduces your power output, makes exercise feel harder, and impairs your ability to regulate body temperature. A good baseline is to drink about 16 to 20 ounces of water in the two hours leading up to your session. If your urine is pale yellow, you’re generally well-hydrated. Dark yellow or amber means you need more fluid before you begin.
You don’t need a sports drink before most workouts. Water is sufficient unless you’re heading into a session longer than 60 to 90 minutes or training in extreme heat.
Caffeine: Dose and Timing
Caffeine is one of the most well-studied performance enhancers available. It improves endurance, strength, and power when consumed in the right amount at the right time. The effective dose is 3 to 6 milligrams per kilogram of body weight, taken about 60 minutes before exercise. For a 150-pound person, that works out to roughly 200 to 400 milligrams, the equivalent of one to two strong cups of coffee.
The 60-minute window matters because that’s when caffeine levels peak in your bloodstream. If you’re using caffeine gum instead of a drink or capsule, it absorbs faster, so you can take it closer to your start time. Doses above about 9 mg/kg don’t improve performance further and sharply increase the likelihood of jitteriness, a racing heart, and GI problems. More isn’t better here.
If you already drink coffee daily, caffeine still works as a performance booster, though habitual users may need a dose toward the higher end of that range to feel the same effect.
Warm Up With Dynamic Movement
A proper warm-up raises your heart rate, increases blood flow to your muscles, and prepares your joints for the ranges of motion you’re about to use. The American Heart Association recommends warming up for 5 to 10 minutes, with longer warm-ups for more intense sessions.
Dynamic stretching, where you move through a range of motion repeatedly rather than holding a position, is the better choice before exercise. Think leg swings, walking lunges, arm circles, high knees, or inchworms. Research shows that when followed by sport-specific movement, dynamic warm-ups improved 20-meter sprint times by nearly 1%. More importantly, no studies have found that dynamic stretching impairs subsequent performance, which makes it a safe default.
Static stretching (holding a stretch for 20 to 60 seconds) is better at increasing flexibility in the moment, improving sit-and-reach scores by about 2.8% more than dynamic stretching in one study. But that increased flexibility comes partly from reduced muscle stiffness and decreased reflex activity, which is exactly what you don’t want right before explosive or strength-based work. Save static stretching for after your workout or for dedicated mobility sessions.
A simple warm-up structure: start with 3 to 5 minutes of light cardio (jogging, cycling, jumping jacks) to raise your heart rate, then spend another 3 to 5 minutes on dynamic stretches that mimic the movements in your workout. If you’re about to squat, do bodyweight squats and leg swings. If you’re about to run, do high knees and butt kicks.
Mental Preparation
What you do with your mind before a workout affects how you perform during it. Mental imagery, the practice of vividly visualizing yourself performing exercises, has been shown to improve focus, confidence, and even technical execution. Athletes who rehearse movements mentally before performing them tend to execute with better form and fewer errors.
You don’t need a formal meditation session. Spending even two to three minutes before your workout visualizing the exercises you’re about to do, including what the movements feel like in your body, the weight in your hands, the pace of your breathing, primes your nervous system for the real thing. Elite skiers, for example, practice “time control” imagery where they mentally run through a course and try to match the mental rehearsal time to their actual performance time, reinforcing spatial awareness and pacing.
For a regular gym session, this can be as simple as reviewing your workout plan, picturing yourself completing your top sets, and setting one or two clear intentions for the session. Knowing exactly what you’re doing when you walk through the door eliminates hesitation and keeps your rest periods productive instead of aimless.
Supplements That Actually Need Planning
Many people associate supplements with pre-workout timing, but most popular ingredients don’t work the way their packaging implies. Beta-alanine, for instance, is a common ingredient in pre-workout powders that causes a tingling sensation in your skin. That tingling has nothing to do with performance. Beta-alanine only works after a chronic loading period of at least two to four weeks at 4 to 6 grams daily, which gradually increases a buffering compound in your muscles. Taking a single dose right before a workout does not improve performance.
If you’re taking creatine, timing also doesn’t matter much. It works through daily accumulation, not acute pre-workout effects. The same goes for most vitamins and minerals. The only supplement with strong evidence for acute, pre-workout timing is caffeine, covered above.
A Quick Pre-Workout Checklist
- 2 to 3 hours out: Eat a balanced meal with carbs, moderate protein, and some fat. Drink 16 to 20 ounces of water.
- 60 minutes out: If you haven’t eaten a meal, have a small carb-rich snack. Take caffeine if you use it.
- 15 to 30 minutes out: Sip water if needed. Review your workout plan and visualize key movements.
- At the gym: Start with 3 to 5 minutes of light cardio, then 3 to 5 minutes of dynamic stretches specific to your session.