There isn't really any such thing as regular yoga. I do know that in the US, many people associate yoga with hatha yoga, which usually means that the focus is on the building blocks of poses and on stretching-type poses.
Inertia is resistance to change. You hate looking at people's feet and yet you stay in your job as a shoe salesman year after year.
The term inertia is more properly understood as shorthand for the principle of inertia as described by Newton in his First Law of Motion: that an object not subject to any net external force moves at a constant velocity.