But it’s enough to help you bang out a few more reps or one more mile, taking your fitness to the next level, Marcora says. Sure, the difference in exertion from 6.1 to 6.7 doesn’t sound huge. Caffeine blocks the adenosine so you don’t feel drained-which makes the workout feel easier. When you exercise, your neurons produce adenosine, a chemical that makes you feel fatigued, says Marcora. The same effect has been found for all types of workouts, including endurance aerobics, resistance training, and high-intensity interval training, he says. Even though all study participants did the exact same workout, the wired group rated their exertion as a 6.1 on a 10-point scale, while the people who took a placebo rated it at 6.7. In one recent study, Marcora gave half of the subjects a caffeine pill before they exercised. The stimulant alters how your brain perceives how hard you’re working during physical activity, according to several studies by Marcora and other scientists. But Samuele Marcora, Ph.D., a researcher at the University of Kent, advocates a safe drug that literally makes exercise easier and more fun. ![]() ![]() Doping typically isn’t endorsed by guys with Ph.D.s.
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