Olympic skier Tess Johnson, 25, says one simple daily habit powers her performance — and it doesn't involve the gym

Olympic skier Tess Johnson

Kirill KUDRYAVTSEV / AFP

• Olympic skier Tess Johnson, 25, says she never travels to competitions without her journal.
• The American mogul skier journals twice daily — and also carves out time to write before her races.
• She says journaling gets her in the right headspace and helps her stay present and off her phone.

Olympic skier Tess Johnson, 25, starts and ends every day with the same ritual that helps her perform under pressure.

In...