Rome was not built overnight, but you can definitely try to discover its historic centre on foot in less than 8 hours with only 5 steps. It's not a stroll in the park, more like a brisk-walking, amazing race adventure around the eternal city's grand monuments and beautiful ruins. Trust me. My sister and I achieved such feat in a couple of hours literally.
Now, here's the thing. As a traveller, I would obviously recommend and prefer taking time in getting to know a place and its people. I think you'd generally agree with me if we start a tour by waking up not so early and enjoy a local breakfast leisurely. But, in our case, my sister had an evening flight to catch and was in Rome for the very first time. So, a quick survey of the ancient city was in the itinerary.
You may start anywhere, actually. Our version of the "Rome by foot in a Day" challenge started at the Roma Termini train station. Now, we invite you to retrace our very same steps. Let me walk you through it. First, make sure you have comfortable footwear on (one time, an Austrian friend walked around Rome barefoot, but it's another story). Then, you may leave your baggage by the train station for a fee. And off we go.