Mark Fisher Fitness

Escape the grim self-seriousness of weight-room culture at this ebullient gym, where you’ll find instructors in onesies, walls adorned with unicorns, and endless high fives among trainers and lifting buddies. Members, or “ninjas,” can take small, high-energy kettlebell courses, gather with up to three others for semipersonal training, or run the gauntlet with the intense, impactful “Snatched in Six Weeks” program.