One of my favorite websites, Redditgifts, does cool gift exchanges every three months and a big, amazing Secret Santa every winter. It’s so big that famous people, like Arnold Schwarzenegger and Bill Gates get involved.
They just announced the next gift exchanges today and there’s a Running and Fitness Exchange! It’s completely free to join and the amount of spending money is about $20 (not including shipping) and you can opt for a domestic exchange or ask to be matched to someone outside of your country (I did that for a snack exchange and got matched with a person in Malta). The person you receive is not (typically) the person who receives you, so it’s even more fun.
Sign-ups are open until August 15th when matching happens. I’ll be signing up for sure, and maybe I’ll get you as a giftee?