Name: Katelyn Block, 19

The problem: At the end of her junior year of high school, she fell into a serious eating disorder.

The change: She was an athlete, but while she was sick, she stopped running. Later, she decided to get back into running. She made the decision to build her body back from the ground up. With a few months of hard work and determination, she graduated from high school with a healthy body.

Name: Amalia Biro, 24

The problem: Amalia was a horseback rider with her sight set on the Olympics, until one day she was thrown off a horse, leaving her left knee badly injured.

The change: She ran a 5K at the request of her friend. Running lets her clear her head. She found herself starting to turn to running instead of breaking away from her social life. And she was in good shape and felt better than before.

Name: Sarah Jane Parker, 28

The problem: She had a lot of fear and anxiety about different things. The fear was taking over her life.

The change: She tried indoor rock climbing with her friend’s encouragement. When she finally managed to climb to the top, she fell in love with the sport. Eventually she used the courage she got from climbing to break away from her fear.

Name: Kimberly Whittaker, 25

The problem: Two car accidents in one month made Kimberly have joint problems in both knees and pain in her lower back.

The change: She joined a gym and worked with a physical trainer three times a week to help her become healthy again. She took spin classes (动感单车) the most often because she felt like she was able to focus her energy just on riding.