Six weeks ago I finished my couch-to-10k training, and ran my first 10k after a gap of 3.5 years. It went well, but the fatigue lasted for two weeks. Afterwards, I fell sick and couldn't start running for two more weeks. Finally last week, I started training again, for a faster 10k. And I realised that running couple of times a week actually makes me feel more rested and full of energy, as compared to a more sedentary life.