Caffeine is a substance that improves brain function and result in alternation of perception, mood and consciousness.
Improves physical - mental performance and improve athletic performance whether it is aerobic or anaerobic.
Delays the onset of muscle fatigue and central fatigue.
Improve reaction time. It's the elapsed time between the presentation of sensory stimulus and the subsequent behavioral response.
Improve endurance: it delays the onset of muscle fatigue and central fatigue.