“Chrissa Carlson of Hampden said Burnalong has helped her get back on track with working out after having a baby last year. “When it’s 7:30 in the evening or after the baby goes to bed, it’s a hard time for me to get out of the door,” Carlson, 38, said. But after receiving a friend’s invitation to join Burnalong last fall, Carlson found workouts that fit into her and her friends’ schedules, which helped with accountability. “It’s kind of funny. When I take a break, I look to see if my friends are taking a break or not,” she said.”