I've recently discovered that paying particular attention to the benefits and positive impact that exercise will have on my life actually makes me more motivated to exercise. I literally meditate on this daily by sitting still for a minute or two and thinking of all the great things daily exercise will do for me personally. Try this yourself, make your mental list a personal list and not just what you think you should say. Think of how great you will look and feel, think of how confident you will be, etc. Writing down the benefits works even better.
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