DIANA RUSSELL, DOING HER STRETCHING EXERCISES ON HER 60TH BIRTHDAY      Since I spend so much of my life typing on my computer, most people assume that I am totally cerebral.  They are surprised to learn that I also work out pretty regularly.  I used to play racquetball three times a week, but after breaking my wrist on the court in 1993, I switched to working out at a gym.  At the end of my workout, I spend a little time doing stretching exercises.  On my 60th birthday, I had photographs taken of me doing some of these exercises.  Here is a selection of these photos. Diana Russell