Caffeine is a central nervous system stimulant that can temporarily improve concentration, alertness, and endurance. The effect of caffeine can vary depending on the person and the amount consumed, but it generally begins to take effect 15-45 minutes after consumption and can last for 3-5 hours.

The best performance of caffeine depends on the purpose of consumption and the person consuming it. For example, if you are looking to improve physical performance, it would be best to consume caffeine 30 to 60 minutes before exercise. In the case of improving concentration and productivity, the best time to consume caffeine would be at the beginning of the work or study day.

It is important to note that excessive caffeine consumption can have negative health effects, such as increased anxiety, insomnia, rapid heartbeat, and gastrointestinal problems. Therefore, it is recommended to consume caffeine in moderation and always in consultation with a health professional.

Coffee can have some beneficial effects at the sporting level, mainly due to its caffeine content. Some of the benefits of coffee in this regard include:

1. Increased energy and stamina. The caffeine in coffee can increase energy and physical stamina by stimulating the central nervous system and increasing adrenaline production. This can help athletes to improve their performance in training and competitions.

2. Fatigue reduction: Caffeine can also reduce mental and physical fatigue, which can be especially helpful for athletes who engage in intense training or long exercise sessions.

3. Improved focus and concentration. Caffeine can improve the ability to focus and concentrate, which can be beneficial for athletes during training and competition.

4. Acceleration of metabolism: Coffee consumption can accelerate metabolism, which can help athletes burn fat and lose weight.

However, it is important to note that excessive coffee consumption can have negative effects, such as anxiety, nervousness, and sleep problems, which can negatively affect athletic performance. Also, caffeine can have a diuretic effect, which can increase the risk of dehydration. Therefore, it is important to consume coffee in moderation and balance it with a healthy diet and lifestyle to get the best results at the sporting level.