Coffee as source of caffeine before and during exercise

The use of caffeinated coffee around exercise has the potential to enhance performance. However, there is limited evidence that caffeinated coffee has the potential to offer ergogenic effects similar in magnitude to caffeine anhydrous. Caffeinated coffee ingestion represents some practical hurdles to athletes, including the consumption of large volumes of liquid and difficulties in quantifying the exact caffeine dose, as differences in coffee type and brewing method may alter caffeine content.

Source: https://journals.humankinetics.com/view/journals/ijsnem/30/1/article-p69.xml