Weight Loss Motivation

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So my boyfriend and I have a challenge going for some extra motivation for me to lose weight. We have 2 jars, one is mine and the other is his. Weigh-in is weekly. I have to lose a pound every week. If I don't lose a pound, I put $5 in his jar. If I do, he puts $5 in my jar. Losing money is definitely my motivation. :)