In 2025 I've been using a walking pad while on client calls. I can't do much heavy design lifting while using it, but for a call I find it to be a huge win in several ways -

1) Exercise is always good!

2) Massively increases focus - walking + talking makes it much easier to avoid notifications / distractions while on a call.

3) Saves so much time! Getting 2 hours of work AND exercise done in the first 2 hours of the day is incredibly efficient.