Earlier today I did 1 K by seven set interval training.
What you do is basically you run 1 k in 4 minutes, and repeat it seven times with a two-minute rest between sets.
But the standard above is for accomplished runners. As for me, 4 minutes is ideal, but not always possible. I aim for it, but usually settle at much worse times.
The first couple of sets are easy, but from the third set you find yourself quickly running out of glycogen, muscle's main energy source.
So the third set though fifth or sixth set are the toughest. Once you have run out of glycogen, you must tap your fat reserve for energy, but it takes time.
Finally around the last set, you feel you are recovering your energy, and find yourself ready to give yourself that last spurt.
Anyhow, seeing your time get worse and worse each time around is not a very pleasant experience. You almost feel like quitting. But I know you would feel even shittier if you did.
So you just live with your deteriorated times, grit your teeth, and bear. Because if you do, no matter how shitty some of your times were, you are blessed with a tremendous feeling of joy, almost like exhilaration when you complete the regimen. And the bad times are already forgotten.
https://www.youtube.com/watch?v=o1XGvR9Mzh8
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