Best of Boston

It was arm and leg day when we came in for a 45-minute session on the “TONEy” — the Lexington-born franchise’s custom-engineered equipment but we felt this workout in our head, shoulders, knees, and toes. A hybrid of resistance training, yoga, and Pilates, Btone uses adjustable springs and a sliding platform to test your core (and your willpower). Yet the fast pace, sing-along jams, and encouraging instructor kept us so motivated we almost forgot we were working out — almost.