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.

Athletic metabolism and energy-system pathways

Metabolism & Energy Systems for Exercise

Understand ATP and the major energy pathways that support explosive power, high-intensity exercise, endurance, and recovery.

ATP production and the phosphagen, glycolytic, and oxidative energy pathways during exercise

ATP & Energy Systems in Exercise

Learn how ATP powers muscle contraction and how the phosphagen, glycolytic, and oxidative pathways overlap to meet changing exercise demands.

Runners completing controlled 200-meter track intervals with walking recovery

Track Intervals: 200m Speed Workout for Triathletes

A controlled track interval workout using repeated 200-meter fast efforts and 100-meter walking recoveries to teach pacing, speed endurance, and energy-system recovery.