Agnieszka Radwanska bares it all  Alan Clarke for ESPN The
Magazine  Radwanska likes to do at least 300 sit-ups in a single
session.  What do you like about your body? AR: I feel fortunate
that I can stay pretty lean without having to do too much gym
work. With tennis, you have to play nearly every day, so I don't
get to spend as much time in the gym as I would like. But for as
long as I can remember I have been playing tennis, so I have a
pretty active lifestyle.   What is your favorite thing you do to
train? AR: Running along the river in Krakow with my sister [WTA
player Urszula Radwanska] is my favorite. Running can be quite
tedious, so running with Ula makes it much more fun. We
definitely motivate and spur each other on. When I'm hurting and
tired, it's good to know she's in the same boat, so we can keep
going together. I can't really remember any intense battles when
we were younger, but there was a spell a couple of years ago
where we kept drawing each other in tournaments, and that was
awful. She's t