There are reasons like, to explore, to breathe oxygen that is free of gasses or air pollution; which helps respiratory problems and it makes it easier to breathe especially if you have asthma.
Bringing a good amount of food because of a limited diet, exhaustion can come in and make the travelers vulnerable to diseases such as flu, so you could take shots and vitamins to keep your immunity up, you bring a map so you don't get lost. To make it easier there should be a path, or a guide, maybe signal on your phone would be a good help.