800 race today

Today I ran an 800m outdoor race. I ran 1:59.6 which is pretty good for a 40 year old. It was decent conditions with a little wind and about 55 degrees F. I was feeling a little tired and had was a little low on energy. I am feeling that I need a little more aerobic work. I also did about 5 miles of cool down running. In the evening I did some ab and upper body weight training with high reps and light weight.