At a certain point many runners notice a decline in their running performance. They notice their speed or pace has gotten and no matter how hard they run they can’t run faster.
A sudden decline in running pace may be a sign you are doing something the wrong way.
Some causes of decline in running pace are ;-
2. Change of training methods
3. Under eating.
If you train too much -back to back days without taking a rest your muscles will get exhausted and sooner or later you will experience a decline in performance. One way you can avoid exhaustion is to space your runs. Run today and rest the next day. If you already feel exhausted take a complete rest for a week.
Change of Running Method.
If you were used to running on flat roads and you have just shifted to hill running this might also affect you running speed. Immediately after shifting to hill running you may experience decline in pace because your body is not used to extra demand. It takes time for our bodies to adjust to the extra demands of hill running. With time the body adjusts and hill running feels normal.
Food is the fuel that drives our run. If you are not eating enough you denying your body the fuel it needs. You can make a rough estimate of how many calories you need based on your weight, the kind of job you have, and your training program. People who exercise regularly should eat about 60 percent of those calories from carbohydrates, 25 percent from fat and 15 percent from protein.
Another fantastic article on this issue is at active dot com. See are you undertraining or undereating