Caffeine - Pre-workout supplement!

It is said that Caffeine is the primary ingredient in all the pre-workout supplements available on the market. Caffeine does improve performance during endurance contests when consumed in doses of 3 to 6 mg per kg (but it varies according to the size and weight of the body). Taking one or two cups of coffee 45 to 60 minutes before a training session can easily provide enough caffeine to support one's performance.

Hey buddy,
Click here to read the article posted on this topic.
It has a lot of facts and saying by Arnold Schwarzenegger. He supports the theory and provided details on how caffeine can contribute to several factors.
I have also attached the picture below that tells the quantity taken according to the quality of workout:

Consuming pre-workout caffeine may boost up your metabolism, suppress the effect of perceived exertion, improve microcirculation, and enhance your athletic performance. The best source of caffeine is coffee as shown in the attached image below:

Most people who drink coffee before a workout consume it for its caffeine, a natural stimulant. Numerous studies suggest that consuming caffeine pre-workout may : enhance a person's physical performance. boost their cognitive function.

YES, Because caffeine can enhance physical performance and cognitive function, it is a popular pre-workout beverage. Although research has shown it can improve athletic performance, especially in endurance athletes, be aware of the risks of caffeine. For example, it can cause insomnia, jitters, and stomachache.

I think yes, becaouse caffeine improved athletes' vertical jump height and boosted powerlifters' performance too.