NANLEYKW got it dead right - running is a hard form of exercise, both in terms of the actually act of running and also the effect it has on the body, especially a beginner.
I have been running for many years, but still have days when my legs feel like lead. In that case, I have to do something else because I know if I head out for a run then I shall only live to regret it, either because of total fatigue or, even worse, injury.
Build up slowly and gradually - you'll reap the benefits in the long run (no pun intended there!) and your body will thank you for it.
Good luck - enjoy your running but stay safe!
Please read my ticker backwards as I am trying to gain weight.
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| current weight: 108.0