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.

Biomechanics illustration showing eccentric, concentric, and isometric movement

Biomechanics: Muscle Actions, Force & Movement

Learn the basics of biomechanics, including muscle actions, forces, range of motion, neurological strength gains, and movement analysis.