: The system treats endurance activities like running, swimming, and cycling as skills to be mastered. It uses the Pose Method to teach efficient running technique.

: MacKenzie emphasizes high-intensity interval training (HIIT) and strength work over long, slow distance (LSD) training to improve both speed and aerobic base.

: Devotes specific sections to the "broken down athlete," teaching mobility exercises—often citing Kelly Starrett's Movement and Mobility Method—to repair and prevent common overuse injuries. Key Content & Resources

, written by CrossFit Endurance founder Brian MacKenzie and Glen Cordoza, is a training system designed to optimize performance and work capacity for endurance athletes while reducing injury risk.

: Features thousands of photographs detailing proper mechanics and drills for running, cycling (road, mountain, and time-trial), and swimming.

: Incorporates CrossFit-style lifting and plyometrics to help athletes generate more force and build "unbreakable" bodies.

: Outlines specific approaches to nutrition, hydration, and electrolyte balance tailored to high-intensity training.