Fitness, at its heart, is about preparedness. It’s about developing the capacity to respond physically, mentally, and emotionally to whatever life throws your way.

So, what’s really going on under the hood when we train? What happens inside the body when we pursue fitness? What is the physiological reality?

Fitness is a word we use often but rarely stop to define. For some, it’s the echo of barbells hitting the floor or the glow of a treadmill display flashing red with effort. For others, it’s muscle tone, visible abs, a resting heart rate in the fifties.