If you want to get to know, how my last five days have been, take 10-15kg backpack, find the nearest sky-scraper and climb up the stairs until the highest floor. When you have reached the top floor, take the elevator downstairs and climb again. And do same thing from around 10:00-11:00 until 14:00-15:00. Sometimes take several steps at once. Sometimes skip the elevator-part and climb the stairs down as well (and then up again of course). Wear a lot of clothes (or ask to heat the staircase ;) - so that it would be very hot. You can have couple of breaks in between - for having muesli-bars and water. In case you meet someone, don't forget to say "Namaste!" (hello, how are you) and mention, which country you're coming from. And in the evening - after the climbing-event - you can watch National Geographic from TV! ;)