This time of year it's very hard to keep our runs consistent especially with all the changes in diet, sleep and hydration.
All these things are very important to how you run the next day. Here is a list of the main things that can interfere with your next run. So if it's a bit hard at the moment see if anything is relevant to you.
1) tired, bad nights sleep
2) change in eating or not enough food or too much
3) not enough proper hydration, this time of year too much alcohol
4) stress
5) about to come down with a cold or something
6) starting too fast because it's cold.
All these things can make your next run harder, so it doesn't mean you can't run, if your going through the program it just means you are learning more about how your body works with running
Our bodies are very complex machines and the more we understand them the more they will give us back
And remember no one fails it is just a bad run.
RFCx.