Like Leo needs any more stimulation! Short of taking performance-enhancing drugs, there is something you can drink that can boost workout or competition performance (a bit) and ease muscle pain.
Caffeine causes muscles to release calcium, which increases the force of muscle contractions. Caffeine also dulls signals from pain receptors in the brain, an effect that can last up to five hours. But don't go overboard.
Too much caffeine can make you feel jittery and anxious. There's a placebo effect, too. Study participants who thought they'd taken caffeine but hadn't still boosted their performance! Maybe all you need to do is think about that double espresso to crush your workout!