I suppose if you've not done exercise for a long time, or if ever, if you're like many of us here (blush) then you can expect to feel discomfort. Hydrating properly is key to this running lark. Good old tap water will be fine but drink plenty of it.
Running does jiggle your middle about and it can be the cause of indigestion and stitch. These niggles do diminish however the more you run and the fitter you get.
The early c25k sessions are mercifully short and shouldn't cause any undue strain but if you're worried then see your GP
Be sure to run only very slowly. No need to speed up.
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