"The biggest way I stay motivated is to run with a group of friends," Felix says. "Sometimes it's hard to get going by yourself, but if you have a plan and a meeting time, you know this run will happen for sure. It's a way to have fun—while also getting in a workout. Plus it distracts from pain, helps you fight fatigue, and gives you that extra push. Even if you're working out too hard to actually have a conversation, just knowing someone else is going through the run with you is so helpful."