What is harder to catch the faster you run?

Why this works

This riddle plays on the idea of physical exertion and breathing. As you run faster, your body demands more oxygen, and you may find it increasingly difficult to catch your breath, meaning to regain a normal breathing pattern. The clever twist here is that while you're running, you're literally trying to "catch" your breath, which becomes harder the more you exert yourself, making it a fun play on the concept of both running and breathing.