Tidy your desk before every session. Nothing unnecessary should be on it - clutter is distracting and makes it harder to focus on the exercise. Keep only what you genuinely use every day on the surface; put the rest in a drawer or on a shelf.
Don't keep a cup of coffee or a glass next to the keyboard. Spilling on a keyboard costs you not just the hardware but lost data and an interrupted training session. Place the cup on the opposite side of the monitor or on a separate coaster, well away from your keyboard and mouse.
Blow out your keyboard with compressed air about once a week - crumbs and dust between the keys gradually wear out the mechanisms. Wipe the screen with a soft microfibre cloth, preferably without harsh chemicals - 70% isopropyl alcohol is enough on its own. A clean screen means less eye fatigue.
A tangle of cables under your desk doesn't just look bad - it makes vacuuming awkward and increases the risk of yanking a plug out. Bundle your cables with zip ties or a cable sleeve - a few minutes of work pays off for years.
Keep your phone out of sight or mute it entirely - every notification breaks the rhythm of typing and disrupts the return to focus. On your computer, enable a focus mode (Focus Assist on Windows, Focus on macOS) to silence app notifications during practice.
Close unnecessary browser tabs and any apps you're not currently using. Fewer windows on the screen makes it easier to focus on the typing itself. The same applies to your desktop wallpaper - on-screen clutter tires the eyes just as much as physical clutter on the desk.
If a stray thought hits you mid-exercise, jot it down briefly on a paper notepad next to you and get back to typing. Pausing to open email or a notes app derails your focus far more than you'd expect.