There are some things that travellers think they are prepared for, only to find that the guidebook said nothing about it. In this case, it’s that Tokyo is made of stairs. Well, mainly the subway public transport system; and not just Tokyo, but also Nagoya and Osaka too. As you will quickly realise on your first day here, it is tiring. Your feet may be sore, and your leg muscles worn, and you have quickly faded at the end of the day.
Before you come to Japan, I strongly, strongly urge you to do a lot more walking as a part of your preparation. If you can use a stair machine, do. Sure, there are escalators and elevators, but stairs are the mainstay. Elevators are few and far between. Even though there is at least one elevator per station, these are impossible to find, or are very inconveniently located. So, if you’re carrying heavy suitcases, have a pram, or in a wheelchair, you will have troubles; so leave earlier than most people would. However, you will have a great time here. Bring high energy snacks to help you get about the place, but you will be a lot fitter for having lived or been here.