100-Day VO2 Max Experiment: What Actually Works | CFBC

100-Day VO2 Max Experiment: What Actually Works | CFBC from CrossFit BC. A coached 100-day VO2 max plan: the real 80/20 split, why wrist heart rate mis-reads Zone 2, one weekly 4x4 session, and how to test and retest without a lab.

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.