Pre-workouts are dietary supplements designed to be consumed before exercise to enhance athletic performance, improve endurance, and increase energy levels. They usually contain a combination of natural and synthetic ingredients, such as caffeine, creatine, beta-alanine, and nitric oxide boosters, that are believed to improve focus, strength, and power output.

The idea behind pre-workouts is that they can help increase blood flow, oxygen delivery, and nutrient uptake to the muscles, which can enhance exercise performance and delay fatigue. Some pre-workouts also contain additional ingredients, such as B vitamins and amino acids, that are believed to support muscle recovery and growth.

While pre-workouts can be effective for improving performance and motivation, it's important to note that they are not necessary for everyone and may not be suitable for people with certain medical conditions or sensitivity to certain ingredients. It's also important to use pre-workouts as directed and to avoid excessive or prolonged use, as some ingredients may have adverse effects on health when consumed in high doses or over long periods of time.