The energy to work out isn’t something you either have or don’t. It’s the result of a handful of controllable inputs: what you eat and when, how hydrated you are, how much light you’ve gotten, and whether your brain chemistry is working for or against you. Most people who feel too drained to exercise are missing one or two of these pieces, not fundamentally low on energy. Here’s how to stack the deck in your favor.
Why Some Workouts Feel Impossibly Hard
Before diving into tactics, it helps to understand what’s actually happening when you “don’t have the energy.” A big part of it is perception, and that perception is driven by dopamine. Research from Johns Hopkins Medicine found that dopamine, the brain chemical tied to motivation and reward, directly shapes whether physical effort feels easy or exhausting. In their study, participants with lower dopamine availability consistently overestimated how hard a physical task was, perceiving it as requiring far more effort than it actually did. That inflated perception made them less willing to try again.
This means the “I just can’t today” feeling isn’t laziness. Your brain is running a cost-benefit calculation, and when dopamine is low (from poor sleep, chronic stress, or excessive phone scrolling), it overestimates the cost of exercise and underestimates the reward. The strategies below work because they shift that calculation, giving your brain and body the raw materials to make movement feel more accessible.
Eat for Energy, Not Just Calories
The single biggest controllable factor in workout energy is what you eat beforehand and when. The Academy of Nutrition and Dietetics recommends eating one to four hours before exercise, depending on how your body handles food. Closer to one hour, keep it small and simple: a banana, a handful of trail mix, or some toast with a thin layer of peanut butter. With a bigger window of three to four hours, you can eat a full meal with a balance of carbohydrates, protein, and fat.
Carbohydrates are your muscles’ preferred fuel source during moderate to high-intensity exercise. If you’ve been skipping meals or following a very low-carb diet and wondering why your workouts feel terrible, that’s likely the answer. A practical pre-workout snack ratio is roughly two parts carbohydrates to one part protein or fat. The Academy specifically suggests a handful of raisins and nuts at a two-to-one ratio as a quick option. The goal is to top off your blood sugar without sitting down to a heavy meal that diverts blood to your digestive system.
If you work out first thing in the morning and can’t stomach food, even a glass of juice or a few dates 20 to 30 minutes beforehand can make a noticeable difference compared to training completely fasted.
Hydration Matters More Than You Think
Dehydration quietly saps workout performance before you ever feel thirsty. According to the Korey Stringer Institute, once you lose just 2% of your body mass from fluid loss, measurable performance impairments kick in, and they get worse from there. For a 160-pound person, that’s losing just over three pounds of water, which can happen surprisingly fast during a warm day or after a night of poor hydration.
The practical fix is simple: drink water consistently throughout the day, not just in the hour before your workout. A good check is your urine color. Pale yellow means you’re well hydrated. Dark yellow or amber means you’re already behind. If you’re exercising for longer than an hour or sweating heavily, adding electrolytes (sodium, potassium, magnesium) helps your body actually retain the water you’re drinking rather than just flushing it through.
Use Morning Light to Wake Up Your Body
If your workouts are in the morning and you constantly feel groggy, light exposure may be the missing link. Bright light stimulates your cortisol awakening response, the natural spike in alertness your body produces shortly after waking. Research shows that exposure to bright light between 2,500 and 10,000 lux significantly enhances this cortisol response compared to staying in dim indoor lighting (under 100 lux). Even 30 minutes of bright light exposure can make a meaningful difference.
For context, a well-lit office is around 300 to 500 lux. Outdoor daylight, even on an overcast morning, typically hits 2,500 lux or more. Direct sunlight can exceed 10,000. So the most effective (and free) strategy is simply stepping outside for 10 to 30 minutes after waking. If that’s not possible due to weather or schedule, a 10,000-lux light therapy lamp placed at your desk or breakfast table can substitute. This isn’t about willpower. It’s about giving your biology the signal it needs to shift from sleep mode to active mode.
Caffeine: The Right Dose at the Right Time
Caffeine works. It’s one of the most studied performance-enhancing substances, and a large network meta-analysis found that a low dose of roughly 3 milligrams per kilogram of body weight is the sweet spot for improving exercise performance. For a 150-pound person, that’s about 200 milligrams, roughly the amount in a strong 12-ounce coffee. Higher doses didn’t reliably produce better results and came with more side effects like jitteriness and stomach issues.
Timing matters too. Caffeine takes about 30 to 60 minutes to reach peak levels in your bloodstream, so drinking coffee right as you walk into the gym means you won’t feel the full effect until you’re halfway through your session. Have it 45 minutes to an hour before you plan to start. If you work out in the evening, be cautious: caffeine has a half-life of about five to six hours, meaning half of what you consumed is still active in your system that much later. An afternoon pre-workout coffee can easily disrupt your sleep, which undermines tomorrow’s energy in a vicious cycle.
A Simple Trick With Beets
This one sounds odd but has solid science behind it. Beets are rich in dietary nitrates, which your body converts into a molecule that widens blood vessels and improves oxygen delivery to muscles. In a controlled study published in the Journal of Applied Physiology, participants who drank about two cups of beetroot juice daily for six days reduced the oxygen cost of moderate-intensity exercise by roughly 5% overall, with specific measurements showing up to a 19% reduction in oxygen demand during steady-state cycling. That translates to the same workout feeling noticeably easier.
You don’t need to commit to drinking beetroot juice every day. Having some about two to three hours before a workout can help. Concentrated beetroot shots are widely available and more palatable than chugging a full glass. Whole beets, arugula, and spinach are also good dietary nitrate sources if you’d rather eat your performance boost.
Rule Out a Medical Cause
If you’re doing everything right (sleeping enough, eating well, staying hydrated) and still feel completely wiped out before and during exercise, it’s worth investigating whether something medical is going on. Iron deficiency is one of the most common culprits, especially in women, endurance athletes, and people who menstruate heavily. When hemoglobin drops below 12 g/dL in women or 13 g/dL in men, exercise intolerance becomes a clinical symptom, not just a motivation problem. Your muscles literally aren’t getting enough oxygen.
Thyroid disorders, vitamin D deficiency, and sleep apnea are other frequent causes of persistent fatigue that no amount of coffee or meal timing will fix. A basic blood panel from your doctor can screen for most of these. If your fatigue is new, unexplained, or disproportionate to your activity level, that’s information worth acting on rather than pushing through.
Build Momentum With the Five-Minute Rule
Even with perfect nutrition, hydration, and sleep, there will be days when you simply don’t feel like it. On those days, the most effective psychological strategy is committing to just five minutes. Tell yourself you’ll do five minutes of movement, and if you still want to stop, you stop. Most of the time, you won’t stop. The hardest part of any workout is the transition from rest to motion. Once blood flow increases and your brain starts releasing those effort-modulating neurochemicals, the perceived difficulty drops and momentum takes over.
This works because it lowers the stakes your brain is calculating. Remember the dopamine research: your brain is evaluating how hard something will be before you start. “Five minutes of walking” registers as almost no cost, so you clear the motivational hurdle. Once you’re moving, the equation changes entirely. Over time, this pattern trains your brain to associate the start of exercise with feeling better, which makes future workouts easier to initiate.
Watch Out for Pre-Workout Supplement Risks
Commercial pre-workout supplements promise explosive energy, but many contain ingredients that are poorly regulated or outright dangerous. Some products have been found to include substances like higenamine (a stimulant that can affect heart rhythm) or other compounds that have no approval for human therapeutic use by any governmental health authority. The supplement industry doesn’t require the same safety testing as pharmaceuticals, so what’s on the label doesn’t always match what’s in the tub.
If you choose to use a pre-workout supplement, look for products that have been third-party tested by organizations like NSF International or Informed Sport. Stick to products with short, recognizable ingredient lists. Caffeine, creatine, and beta-alanine are well-studied and generally safe for healthy adults. Anything with proprietary blends that hide individual ingredient amounts is a red flag. The simpler and more transparent the product, the better.