Olympic gold medallist Katherine Grainger has returned to rowing for the first time in two years.

The 38-year-old, who won gold in the women's double sculls at London 2012, took a break to complete a PhD in homicide.

Now, the sportswoman has decided to return to training ahead of the Rio Olympics in 2016.

"There are going to be big challenges ahead in coming back after two years away," Grainger told BBC Sport. "But if I don't try, I'll always wonder 'what if?' and for me, that will be so much harder to live with."

Before London, Grainger won silver medals at the three previous Olympic Games.