Rae Johnston went from being a couch potato to a wonder woman. She said that it's important to find an exercise that you love and she loved hiking. Here are some reasons why:

1. It can be social - you can hike with friends or family
2. It's not expensive - all you need is a decent pair of shoes, sunscreen, hat and water bottle
3. You feel like you've taken a mini holiday because you got away from your usual surroundings
4. It's accessible - you can get there by bus or train (or on foot)
5. You can set your own difficulty level - you can walk for an hour or all day, on flat ground or up a hill.

You can find out more about Rae Johnston and her journey at www.lifehacker.com.au.