Registration for the YWCA’s Tween Summer Program is now open. Children from grades 5-7 will enjoy a variety of fitness challenges geared towards enhancing their cardiovascular and muscular systems while targeting core strength and balance. Participants might be athletes or just want to get in shape and get strong. Instructors are certified personal trainers and fitness instructors offering the highest quality instruction around. Each session is two weeks and meets twice a week. Sessions will be held on Tuesdays and Thursdays starting at 9 a.m., and registration is $50. For more information, call (978) 465-9922.