Drinking an energy drink before running can make sense for some runners who tolerate caffeine well and want a temporary boost in alertness and perceived energy, especially before longer or early-morning efforts. However, the combination of caffeine, added sugar, and other stimulants can cause jitters, stomach upset, dehydration risk, or heart rhythm discomfort for others. The right choice depends on your caffeine tolerance, the run’s intensity and duration, your health status, and what you’ve eaten. If you have heart, blood pressure, anxiety, gastrointestinal conditions, or are pregnant, consult a healthcare professional first.