Lift a heavy stone, jump over a fence or run to catch a ball and you will be pleased with yourself. You will have a sense of your own power and ability. You will feel invigorated and possibly a little out of breath. Your pulse rate will raise briefly. You have done something, performed an action, acted, been an actor. Even if your capabilities are limited, as everyone’s are to some degree, you will still want to exercise them, preferring to do what you can alone and accepting help only when needed. Catching a ball is a simple but disproportionately pleasing activity. An exercise in hand–eye coordination, it consequently feels like an achievement. Satisfaction comes with a clean take: when the ball smacks perfectly into the palm of your hand, sticking securely.