Adrenaline a.k.a Epinephrine is a chemical that increases the heart rate and blood pressure and so during say a Tennis tournament that you played over the weekend and lost maybe badly? our hearts beat faster because basically we're striving to get to the Finals, get the achievement and if we lose, we get angry at the player whose got the achievements. I can tell that I’m getting much better at dealing with my losses. How? I did not waste a single second, I signed up for another tournament and back up on the horse I go.