??She was loving her life as a healthy young professional and fitness instructor.But one day while teaching an aerobics class she collapsed-and spiraled into a life-threatening health crisis.Kristy Sidlar needed a new heart.Now in her gripping memoir Change of Heart: My Journey of Transplantation Revelation & Transformation she provides fascinating and inspiring insight into her extraordinary survival story that chronicles her frightening heart failure-and her triumph over what could have ended