Mark Curp held the World Record in the Half Marathon for 21 years and also set the American Record in the 20k. He was elected to multiple Hall of Fame Classes and made it all the way to the Olympic Trials. Later in life, cancer changed his family dynamics. Through it all, Mark reminds us, "Most of us face more difficult or challenging circumstances than winning. It's how you handle the difficult things that make you who you are versus what you win or what you achieve." List...