Focus on the trail, not the trees. Definitely not the trees passing your handlebars as you bike through. Or the drop-off threatening the outside path of your tires as the route turns and narrows. Where your eyes are directed your attention will follow. It can be a mental fight – holding your focus in a distraction-oriented environment. A faster pace requires more concentration.
“Learning how to think…means being conscious and aware enough to choose what you pay attention to and to choose how you construct meaning from experience…you get to decide what to worship.” –David Foster Wallace
What you can control is your focus. What to think about. What to ignore. Particularly what to ignore. Where to (not) invest your time. Which things (do not) warrant a response. Staying safely focused on your path means letting some things pass intentionally in the woods.