Ergodynamics takes into account that everything about standing or walking while typing is different than when users were seated at a desk.
Ergonomic Keyboard Trays
In this primer we cover everything you need to know about how to install a SteadyType keyboard tray on a treadmill desk.
Among trays we've tested, the SteadyType Exo is the most stable, easiest to install, and the best at achieving “negative” ergonomic angles.
WorkWhileWalking's graphic guide to the options for the Humanscale Keyboard Tray. Pick and choose mechanism, keyboard tray, mouse tray, and palm rests.
If you can’t afford a tray with tilt, then this Fellowes Keyboard Tray is a fine accessory for your workstation that helps to prevent strain on your elbows.