I've been using one for years. I have a hard time reading detailed documents that are printed out since I'm moving, but find that I'm better/more efficient at drafting and reviewing while I'm walking. According to my fitbit, it burns about 500 extra calories a day, which has kept me from the middle-aged spread I'm fighting. Since you aren't really sweating and getting your heart rate very high, it doesn't translate to the ability to run a 5K, at least for me.

My past couple workplaces have had them. I don't find it difficult to work while walking - they both maxed out at 2 mph. I mostly do emails or review docs.

Not sure if it helps with my health/fitness but it helps me hit StepBet goals...

Do you use one? How difficult is it to work while walking? What kind of work do you do? Did your employer pay for it or you?

Has it made a difference in your health? Fitness?