The BEI Presents Live Exercise Webinars to Support Your Wellbeing. Email the BWHBEI@bwh.harvard.edu for more information and how to access live and recorded classes. This class will target the core muscles from all directions with exercises designed to improve strength, stability and posture. End with some light stretching for optimal recovery. Note: Class times subject to change. Registrants will be sent the most updated class schedule by the Monday of that week.