It's crazy how you can make your body adjust to your state of mind. If you told me to run a half marathon while weight training 9 months ago, I'd tell you: "No chance. You're crazy."

Long story short, I ran my first unofficial half-marathon a month ago, another three after, and, in about two months, my first official half-marathon race.

Key takeaway: You can do anything you set your mind and heart to, no matter how challenging.