They say exercising with a partner is a surefire way to increase mutual attraction. Tour de Troit’s annual 5K is held the Saturday before Fat Tuesday, meaning it falls on Valentine’s Day this year. Everyone who finishes gets a paczek and a beer — probably more than negating all the calories you just burned off, but whatever. Guides from Iyengar Yoga will lead a group stretch before the race.

Price: $40 ADV - $45 DOS