Let My Gym in Bethesda or Potomac host your child's next birthday party! With no mess to clean up at your house and 1.5 hours of nonstop action-packed activities, games, songs, and fun for up to 21 children, a My Gym birthday party is a win-win for all! Visit www.mygym.com/bethesda or www.mygym.com/potomac for more details about birthday party packages. Basic paper package included. Upgrades available.