Which are some great lower body workouts without being stuck in a gym?

I know there are a ton of workout videos and gym equipment in the fitness industry. I’m not interested in owning all those bulky gym machines that take-up so much space in a household, (maybe something no too big) that can be moved against a wall after use.

Which workout videos, exercises are highly effective in improving lower body strength? from a job that includes a lot of standing-up, walking throughout the day.