How to build endurance in games

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Avatar of cellothere28
I am looking into playing chess games with 100 minutes on each clock to get an official rating. This is way longer than I usually play and I’m wondering how should I prepare and build up endurance so that I can play these games.
Avatar of PerpetualPatzer123
Exercise! Running, biking, and swimming will all help your endurance! You should be physically fit to play these long games!