Two or three times a week, I put my body through the ringer. For thirty minutes, I do exercises that a man approaching forty probably shouldn’t attempt. I throw my body to the ground and spring up as quickly as I can. I push a weighted plate across the floor. I crawl like a bear up and down mats made of rubber. After all that is finished, I put on boxing gloves and hit a heavy bag that sometimes feels as if it’s made of concrete. When I kick it, my foot and shin turn red and bruise. My shoulders and arms feel as if they’re weighted by stones.