https://mattshannonsecuritypro.com/2026/08/01/first-principles-of-performance-part-i-cardio-doesnt-kill-your-gains/Matt Shannon, Security Proen2026-08-01T05:03:48+00:00First Principles of Performance –Part Icrossfit, hypertrophy, recovery, strength training, adaptation, first principles of perfomance, hybrid, strength and conditioning, human performance, endurance work, energy systems training, exercise physiology