Add extra steps every day by parking (or getting off a bus) farther from the building entrance. Then, take at least one flight of stairs if you're able.
This may seem too small or trivial to matter, but it isn't! I almost always do both of these, but one day, I went to the gym with a friend and rode the elevator with her. It honestly took me longer to find my usual pace for walking!
A few extra steps and maybe a flight of stairs helps you "get started" with less effort!
No equipment is needed and you have the extra benefit of saving gas if you drive!