You decide. This is a photo of Jelena Jankovic in training, courtesy of Women's Tennis Blog.
Isnt it reminiscent of a method practiced by Dr. Walter Bartoli in years gone by, as discussed in the
post Bartolicraft in November 2007. (See the video link in the post from 4:50 onwards.)
Walter, he's just that mad professor, you know, the Buckminister Fuller of the tennis world (Bucky balls guy). His methods will never catch on.. will they?
As the saying goes, there is method in the madness.
Bartolicraft - Patent Pending!!! 
Thank you