MARSHALL - Heather Martin and Neil Osten announce their engagement. Parents of the couple are Steve and Julia Martin of Marshall and Mark and Julie Osten of Verona, Wis. Martin is a graduate of Winona State University and the University of Minnesota with a master's degree in exercise physiology. She is a health coach for LifeTime Fitness. Osten is a graduate of the University of Minnesota with a degree in mechanical engineering, and is employed by Target as an engineer. The couple plans to be married Oct. 25, 2013, in St. Anthony and make their home in Minnetonka.