Do the mindless internet browsing in coffee shops, it's a bit better. Cycling is my preferred exercise, either having a look around town, or off to the next town, catch the train back, or cross country. Unless you join a club it's fairly solitary, but it gets you out, covers more ground than running, provides a bit of adventure, keeps you occupied, distracted, avoiding monotony. Weed doesn't work for me, swap it for coffee.