When I first did this about seven years ago, pre-made "treadmill desks" started at around $1,500—though entry-level walking units—now appear to start around $500.

Those who choose a DIY option may find that the treadmill part of the desk doesn’t offer longevity. A dedicated treadmill desk option like those offered by LifeSpan can be fairly expensive.

Treadmill desks are popular, even aspirational, in many offices today because they can help those of us who are deskbound move more, burn extra calories and generally improve our health.But a new ...