Primal Endurance: Escape chronic cardio and carbohydrate dependency and become a fat burning beast!

by Mark Sisson

Aerobic improvement can be tracked by conducting Dr. Maffetone’s Maximum Aerobic Function (MAF) test. You complete a fixed course (e.g., run eight laps) at a fixed heart rate (max aerobic: 180 − age) and obtain a finishing time.

Max aerobic function