The End Game (Thron series #1)

Jude Thron became a widow at 32; she has two small children and a dream to break the woman's world record in 10,000m run. When she succeeded, her life turns.
Andrew Bedford was one of the greatest runners in the world, but his time has passed. His last chance for greatness is to train Jude to become a champion.
However, will they be able to work and train together? The sexual tension only increases when they try to stay away from one another.