Hello Franz !! Uhhh,.... It seems that the tennis players are not in a rush to answer you!
(They don't like to even think of temperatures below 60F.) My idea is that the effort put
into each sport can help both. For example, making quick carving turns left & right can
strengthen the legs for the instant push offs each way in returning a tennis serve. Sliding
into the corner of the court to hit the ball, helps our balance in ski turns.
Oh for the good ol' days! Many years ago, I lived for the whole year at Squaw Valley!!
That was before the big resort construction. I remember if I went outside at night in the
summer, on a night with no clouds, I could see thousands of stars in the sky. Very peaceful!!