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One reason why people procrastinate so much is present bias, which is the tendency to overvalue near-term rewards in the present over making incremental progress on long-term goals (see short-termism in Chapter 2). It's really easy to find reasons on any given day to skip going to the gym (too much work, bad sleep, feeling sick/sore, etc.), but if you do this too often, you'll never reach your long-term fitness goals.