Any accepted wisdom on staying motivated?

I'm trying to lose some weight as I'm a short time overweight. I'm also trying to improve my fitness. Problem is I'm just a bit overweight and I don't have great will power. Any tips on how to motivate myself to exercise (I want to exercise fairly than go on a strict diet as I'm currently really apathetic...) a lot of culture keep "thin"spirational pictures around, but i do the differing. i keep FAT pics of me around so i can remind myself of how i DONT want to look.
chomp through some sugar

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