Photograph by Jim McWilliams

Running a marathon’s a huge accomplishment but can be a pretty scary undertaking, especially for first timers. Tonight at 7 p.m., Philadelphia Marathon medical director and Rothman Institute sports medicine surgeon Steven Cohen will answer your questions in a live web chat. He’ll hit on injury prevention, how to hydrate properly, what to eat and more. The free chat will last an hour. Head to rothmaninstitute.com/chat to join in.

FREE, November 13 from 7 to 8 p.m.

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