December 01, 2025 • By Katie Switow • Blog

Common Pre-Workout Mistakes That Can Hurt Your Performance

Common Pre-Workout Mistakes That Can Hurt Your Performance

When you know the most common pre-workout mistakes and adjust your habits, you give yourself a better shot at steady energy levels instead of a grumbling stomach, muscle cramps or poor performance halfway through the session.

 

Why Your Pre-Workout Routine Matters For Athletic Performance

Think about everything your body does in a single workout session...your heart has to increase the blood flow to your muscles, while your brain stays focused on maintaining good form, and your glycogen stores provide carbohydrate energy so you can keep moving. It's a super complex activity.

If you have the right pre-workout routine, it supports your athletic performance by giving your body enough fuel and fluid ahead of time, so you are not constantly fighting low energy levels or digestive discomfort.

 

Showing Up On An Empty Stomach

Training on an empty stomach is one of the most common mistakes people make. It might feel convenient to squeeze in a workout session hungry before work or on a busy weekend morning, but it can quickly drain your energy levels. When there is no recent balanced meal or pre-workout meal on board, your body has less access to quick carbohydrate energy, and you may feel lightheaded, distracted, or irritable.

Instead of avoiding food entirely, aim for a small or substantial snack that will settle comfortably. For many people, a good snack one to three hours before exercise could be grain bread with nut butter, yogurt with fresh fruit, or a jelly sandwich made with sensible portions of each ingredient. These food choices give you some carbs, a little protein, and healthy fats without too high a quantity of any one thing.

 

Ignoring Hydration Until You Start Moving

Another group of common pre-workout mistakes happens with fluid. Many people wait to drink water or a sports drink until they arrive at the gym, then chug minutes before their workout starts. That rush of fluid can lead to sloshing, digestive discomfort, and sometimes even muscle cramps once your heart rate rises.

Showing up adequately hydrated helps your heart pump blood flow where it needs to go and helps regulate body potassium and other electrolytes.

Plain water works well for many sessions, but electrolyte supplements like our LIVPUR Hydrate often work better for longer or hotter workouts. A sports drink can help replace electrolytes and provide quick carbohydrate energy, and some people prefer lighter sports drinks that they can sip slowly.

 

Leaning Too Hard On Pre-Workout Supplements Or Energy Drinks

Pre-workout supplements seem to be everywhere now, and a pre-workout supplement can be useful when it fits into your overall habits.

Too much caffeine from a pre-workout supplement, extra coffee, and canned energy drinks can leave you jittery, dehydrated, and wired at bedtime. Some pre-workout supplements and energy drinks also contain added stimulants, so stacking them without reading labels can set you up for headaches, heart pounding, or a crash mid-session. That is a quick path to a sub-optimal workout, even if the actual training plan looked smart on paper.

We built our LIVPUR Energy formula to be NSF certified for sport, meaning it is safe to consume and doesn't contain any of the hidden ingredients found in some pre-workout powders!

If you enjoy a pre-workout drink or pre-workout supplements, we always recommend using them in sensible portions and pairing them with a real meal or snack. Our powdered formula comes in a single-serve stick, easy to slip in your pocket and impossible to overdo!

 

Choosing The Wrong Pre-Workout Meals Or Portions

Even when people remember to eat, food choices can still trip them up. Some pre-workout meals are simply too heavy or too high a quantity for the time you have before you move. Others have very little volume but are not balanced enough to keep your energy levels from dipping.

For all of those reasons (and more) we think portion control is a huge part of avoiding the most common pre-workout fueling mistakes. You want your "food to settle" comfortably, not sit like a rock in your stomach. We always pay attention to how much fiber we're eating in the hour or two before exercise, since high fiber meals right before training can upset some stomachs.

Not sure where to start? Try varying quantities of your fiber intake at different times of the day to see what supports a solid workout and what leads to a suboptimal workout instead.

 

Why Do I Feel Bloated When I Exercise Hard?

If you eat a substantial lunch and then head straight into intense training, you may feel sluggish, sleepy or bloated. It’s more common than you’d think! Most people feel best when they have a balanced meal two to three hours before training, with a small snack closer to their session if they need it. 

For us, that snack usually happens thirty to sixty minutes before a workout, but this ultimately depends on your stomach sensitivity and the session plan. The goal is always to feel sustained energy for your workout, without crashing for the rest of the day. LIVPUR Energy is a great addition to your pre-workout snack, especially when you have a tough training session planned! 

 

Building A Pre-Workout Plan That Supports Your Fitness Goals

Once you understand your own patterns, you can shape a pre-workout routine that fits your fitness goals instead of working against them. If you are trying to drop a few pounds, you may worry that eating before a workout will slow progress, but arriving depleted can actually hinder progress by making it harder to train consistently. If your goal is strength or muscle gain, showing up under-fueled over and over will not give your body what it needs for muscle recovery and growth.

Start with your calendar. On days with a big workout, plan a balanced meal or substantial snack that includes carbs, protein, and a bit of healthy fats two to three hours beforehand. Pay attention to your glycogen stores by including carb sources like oats, rice, pasta or grain bread. On lighter training days, you may only need a small snack, such as yogurt with fruit or toast with nut butter.

As you refine your habits, notice where pre-workout fueling mistakes still slip in. Maybe you forget your portable snack, so you end up doing a hard workout session still feeling hungry. Maybe your carb-load mindset leads you to overshoot with portions the night before, and you wake up feeling sluggish. These are all common mistakes, but they are fixable once you recognize them!

Over time, your food choices, drink choices, and supplement choices begin to feel automatic. You arrive at each workout properly fueled, adequately hydrated, and mentally present, so your energy levels support the work you want to do instead of fighting it.

If you like to sanity check your plan against broader guidance, sports nutrition groups like the Academy of Nutrition and Dietetics and the International Society of Sports Nutrition generally suggest a carb-rich meal or snack about one to four hours before longer sessions, with smaller portions as you get closer to start time.

That kind of consistency does not just help you through today’s workout session. It quietly adds up over months, helping you protect your muscle recovery, stay on track with your fitness goals, and step into each session confident that your pre-workout choices are helping rather than getting in the way.