3 mile slow run, 1 mile swimming

In the afternoon, I went to stadium and run 8 laps slowly in about 36 min. I planned to run more, but after 8 laps I had some feeling of my knees. I feel the surface is sort of hard compare to campus road. The best surface is the track, but running there is a little boring if I run every time there. I then ate an apple pie as snack and rest for about 20 minutes. I stepped up to the top of the seats twice after rest. Finally, I went to swim. I swim 1+2+800 and then 3 laps flutter kick with board. At last, 2 laps easy breaststroke. During the 3 hours exercise, I drank 32 Oz water.
Nice easy exercise today, not very tired.