Martyn Cassidy, a 49-year-old quantity surveyor, has set out to complete 50 organised running events in a year to raise funds for Francis House Children’s Hospice. As he nears his 50th birthday on June 28, Cassidy has chosen the Great Manchester Run as his 46th event in support of the beloved Manchester children’s hospice. Cassidy’s motivation for his “50 for 50” challenge is to celebrate his…