Brandon is 17. In this video, he talks about gaining 140 pounds during his childhood and teen years, and how he took charge of his weight and lost 70 pounds.

The simple act of riding his bike to school not only got Brandon on track for weight loss — it also inspired him to do things he couldn't have imagined doing before. Today, Brandon is a lot more confident — and he's training to take part in a triathlon.

Check out his story in this video.