For the novice runner, I'd say to give yourself at least 2 months of consistently running several times a week at a conversational pace before deciding whether you want to stick with it. Consistency is the most important aspect of training at this point.
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If you look at the themes that he struck from the minute he started running for president through today, there is a very high level of consistency, and there is a sense that he is who he is. Obama's governing is completely consistent with the way he campaigned and the themes on which he campaigned, the issues he highlighted, the vision he shared.