I was an out of shape 36 year old who decided to get in shape. I started going to the gym and working out and decided I liked running.I went from 5K's to Marathons in about two years and had a great comfort level on how to measure my runs and get better.I had done some sprint triathlons and liked the challenge, but never had the proper equipment to measure my cycling. Enter the CS300. It helped me to keep track of my heart rate and more importantly how to fuel my body effectively by keeping track of my caloric output.The cadence feature helped me become a better and more proficient cyclist.The added confidence in cycling made me decide to sign and train for an Ironman.At the age of 41 I completed my first Ironman and got off my bike feeling like I had just woke up and was ready to do a marathon. I am not sure I could not have accomplished this without the help I got from the CS300.