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.
In common usage, the term inertia may refer to an object's amount of resistance to change in velocity (which is quantified by its mass), or sometimes to its momentum, depending on the context.