Working out with friends equals instant accountability — but what if you’re surrounded by gym-o-phobes? Enter SweatCity app. It’s similar to Tinder, but for workout buddies. You can select what you’re looking for (whether it’s a runner, yogi or lifter), chat with those you match with, and set up a calendar invite to sweat it out at your local workout haunt. Here are more health apps that are totally worth downloading.