For some reason, strenuous exercise on a real scorcher of a day is very addictive. Each summer I feel it. The mercury climbs above 35 degrees (in the shade), the humidity weighs like a hot blanket, and the sun beats down. I have an uncontrollable desire to get out: sprint up the steep hill nearby a few times; run for an hour; push weights for an hour more. At the end I am a rag, soaked and pouring with sweat. My head feels like it is about to burst from the heat. But I love it. Afterwards I feel cool in the heat, my mind is sharp, and I feel serene with the world.