South Boston’s fitness scene is booming — with new studios popping up left and right. From boutique Pilates and heated yoga to old-school strength gyms, Southie has quickly become one of Boston’s hottest fitness hubs. Whether you’re a longtime local or new to the neighborhood, here are the studios you’ll want to know. Pictured: btone FITNESS, Mass Underground Southie, Summer Street Wellness, Peter Welch's Gym Barre Groove 📍 416 W Broadway Suite 202 Fun, dance-inspired trampo