给出一个任务，要求根据已有的短文写一篇小短文。


请提供一个原始短文和一个主题。
原始短文：
"Samantha woke up early in the morning and decided to go for a run. She put on her running shoes and headed out the door. As she started to run, she noticed a group of people on the street holding up signs and cheering. Samantha didn't know what was going on, but the positive energy made her feel good. She continued running and eventually came across a park where there was a charity 5K race taking place. Samantha decided to join in and ran the race with the other participants. She may not have won, but she felt proud of herself for participating and making a difference."

主题：跑步对身体和心理的好处