The strongest community-based groups are sometimes built out of friendships, which was the case for The fitCene, a local networking and fitness group for women. In 2015, Chevy Chase residents Mary Jo Slidell and Lauren Rice, and Jill Wiener of Bethesda, founded the group, which partnered with area fitness studios for 50 events in the first year. Since then, the founders have been focusing more on sharing information and resources. At thefitcene.com, there’s a forum where members can post about places or ways to work out. There’s also a recipe exchange in which women can share nutritious meal ideas that complement their workouts. Membership, which is free, has grown to more than 500 women. Bonus: One study says working out with friends results in more calories burned.