Zone 2 and HIIT: The Complete Guide to Cardio | CFBC

Zone 2 and HIIT: The Complete Guide to Cardio | CFBC from CrossFit BC. The complete coach-built guide to Zone 2 and HIIT: what each does, how to balance easy aerobic base with high-intensity work, and weekly polarized templates for CrossFit and HYROX.

This is a long-form CrossFit BC reference piece. We cite the research we lean on, show how we apply it with members in the gym, and keep the practical takeaways at the top so you can act on them the same week.