If you run, you have likely heard the debate before. Trail runners claim the uneven terrain makes you functionally stronger. Road runners counter that you cannot build strength without resistance training, and that pace is what truly builds power.

The truth is more nuanced than either extreme. Both surfaces challenge your body in unique ways, but they target different muscle groups, energy systems, and movement patterns. Understanding these differences can help you become a more well-rounded, resilient, and stronger runner.

You've got your form dialed in. You're progressively lifting heavier weights. You're eating right and getting enough sleep. But there's one thing you might be missing—something so fundamental that most people never even think about it.

Breathing.