chris hinshaw and sara sigmundsdottir talking on the track
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Tough Endurance Workout from Chris Hinshaw and Sara Sigmundsdottir

Time to forge an unstoppable engine.

“This track session got real really quick ??‍♀️?.”

  • 4 sets
  • 4 x 400 m with 40 seconds rest between reps 
  • 4 min rest between sets

More from Chris:

Chris Hinshaw: How to Build a Bigger Engine for Crossfit

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