Integrated exercise physiology showing muscle fibers, metabolism, heart rate, and VO2 max

Energy Systems, Heart Rate & VO2 Max

Connect muscle fibers, biomechanics, energy systems, heart rate, VO2 max, and resistance-training variables into one exercise-science framework.

Periodization chart showing macrocycles, mesocycles, and microcycles

Periodization: How to Build a Training Plan

Learn how macrocycles, mesocycles, microcycles, and different training-week types create a structured path from baseline fitness to a goal.