Germans in Nature

It's back to nature day on the blog with those 1900-1940 Germans who loved to frolic outdoors nude.  Our R-rated series begins with this photo that I can't quite figure out.  He's standing on tiptoe and seems to be skipping rope, but there's no rope.  Odd.  I have other photos made in this walled terrace area that seem to be more directly athletic, so maybe he left his rope at home.