Vis inertiae

A body, from the inactivity of matter, is not without difficulty put out of its state of rest or motion. Upon which account, this Vis insita may, by a most significant name, be called Vis inertiæ or Force of Inactivity.

I would have something that can dissipate the vis inertiæ and give elasticity to the muscles.

[H]er admonitions, tho' they were powerful enough to convince, would have been insufficient to overcome the languor and vis inertiæ of her brother, had she not reinforced her arguments, by calling in question the credit of two or three merchants, with whom he was embarked in trade.