After losing his sister to brain cancer, David Richman turned his fitness passion into a platform to raise awareness for cancer.  David, author of Cycle of Lives, tells us about some of the 15 cancer patients featured in his book and the remarkable 5,000-mile cross country bike ride that tied it all together. Through his book, David helps us understand the many emotions behind cancer patients, caregivers, survivors, and widows. David, is another athlete doing good.