Cardio is not the answer. Building Strength is. The Lie We All Fell For When most adults decide they need to “get fit again,” they do one thing: They start running. Maybe it’s guilt. Maybe it’s nostalgia. Maybe it’s because running feels like the thing “fit people do.” So they lace up old trainers, hit the pavement, and within 10 minutes remember why they stopped doing this in the first place: Knees ache. Shins burn. Lower back tightens. And the lungs feel like a fire alarm w