Danish Caroline Wozniacki told how she maintains her fitness after retirement.
“I never liked diets, but I always tried to keep fit as efficiently as possible. I like to run, but my body doesn’t really, so I prefer exercise bikes and cardio exercises.
Since the age of 12 I have been doing boxing, using it as a cardio. After tennis, I like boxing and running the most. I used to swim well. I like all kinds of sports, “Wozniacki quotes Tennis World USA.