We are never still even when you may think you are. Think about it. You're on a big blue planet that's constantly spinning on an axis at ~1000 mph. Then we are, at the same time, orbiting the sun ~67,000 mph or ~19 miles per second! But it doesn't stop there, our solar system is hurling thru space with our galaxy at speeds of 515,000 mph.
So ask yourself the next time you are sitting "still" am I really.