chris hinshaw and sara sigmundsdottir talking on the track

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