Online registration may not be allowed for all activities. To enroll into a group exercise class, please reserve your spot via our mobile app [https://ymcagbw.org/mobileapp#faq-question-949250480]. Please contact us during regular business hours for registration information. Les Mills CORE is a 30-minute workout, designed to tone your body, improve your core strength and aid with injury prevention. Please bring your own mat. Category Exercise, Health and Wellness Location Group Ex Studio at Upper Main Line Branch Instructor Colleen Brawn