![Kayla Harrison celebrates successfully defending her Olympic gold medal at last year's Rio Olympics.](https://media.cnn.com/api/v1/images/stellar/prod/170818180721-kayla-harrison-gallery-1.jpg?q=w_3000,h_2000,x_0,y_0,c_fill/h_447)
Kayla Harrison celebrates successfully defending her Olympic gold medal at last year's Rio Olympics.
![The American defeated France's Audrey Tcheumeo in the 78kg category.](https://media.cnn.com/api/v1/images/stellar/prod/170818180724-kayla-harrison-gallery-2.jpg?q=w_3000,h_1999,x_0,y_0,c_fill/h_447)
The American defeated France's Audrey Tcheumeo in the 78kg category.
![This backed up victory in the same event at London 2012.](https://media.cnn.com/api/v1/images/stellar/prod/170818180726-kayla-harrison-gallery-3.jpg?q=w_4256,h_2832,x_0,y_0,c_fill/h_447)
This backed up victory in the same event at London 2012.
![Harrison also has one world championship title to her name, from Tokyo in 2010, when she became the first American woman to win gold in the tournament in over a decade.](https://media.cnn.com/api/v1/images/stellar/prod/170818180729-kayla-harrison-gallery-4.jpg?q=w_3064,h_2064,x_0,y_0,c_fill/h_447)
Harrison also has one world championship title to her name, from Tokyo in 2010, when she became the first American woman to win gold in the tournament in over a decade.
![That proved to be her only world championship gold. The next year, Harrison lost to familiar foe Tcheumeo in the semifinal and went on to claim bronze.](https://media.cnn.com/api/v1/images/stellar/prod/170818180734-kayla-harrison-gallery-7.jpg?q=w_2100,h_1402,x_0,y_0,c_fill/h_447)
That proved to be her only world championship gold. The next year, Harrison lost to familiar foe Tcheumeo in the semifinal and went on to claim bronze.
![Harrison, now retired, used to train with UFC fighter and Ronda Rousey, the first American to win an Olympic judo medal.](https://media.cnn.com/api/v1/images/stellar/prod/170818180730-kayla-harrison-gallery-5.jpg?q=w_3760,h_2503,x_0,y_0,c_fill/h_447)
Harrison, now retired, used to train with UFC fighter and Ronda Rousey, the first American to win an Olympic judo medal.
![Harrison admits she has struggled with depression following her Olympic highs of last year, but has been dividing her time between media duties and writing a book.](https://media.cnn.com/api/v1/images/stellar/prod/170818180732-kayla-harrison-gallery-6.jpg?q=w_3000,h_1997,x_0,y_0,c_fill/h_447)
Harrison admits she has struggled with depression following her Olympic highs of last year, but has been dividing her time between media duties and writing a book.