Which is the easiest workout when you are short on workout equipment?

I remember this situation where I was in a home rental in Mussorie without any equipment to exercise. This is when I used to be serious about bulking up and wasn't carrying anything extra that had to be cut. This is when I realized that with a couple of bricks, some stairs, and a bit of determination & creativity, exercising without equipment is possible. The dependency on machinery is more due to what we start believing in as irreplaceable workout essentials - heavy equipment should be on this list!