I either go for a run, do some resistance training, or take/teach martial arts lessons. It really helps me feel sharper and more productive when coding the next day.
My Blog A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects. - -Lazarus Long