• Fighting Muscle Diseases: #abcDrBchat Tues. Aug. 27, 1 p.m. ET

Closeup photo of Olympians Bart Connor and Nadia Comaneci

ABC News' Chief Health and Medical Editor, Dr. Richard Besser will moderate a Twitter chat on fighting muscle diseases Tuesday at 1 - 2 pm ET.

The chat will include Olympic gold medal gymnasts Bart Connor and Nadia Comăneci (pictured right), plus Mayo Clinic and other medical institutions.

Here's how to participate in Dr. B's live twitter chat.

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