Replies
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Def caffeine withdrawl. I have the same symptoms. I have been an avid caffeine drinker and to try to quit is so very hard. It took me about a month but its doable. stick to the water!
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I dont have any experience with a Polar but I know a LOT (at least 8-10 people) who have them and all have had really wonderful things to say about them :) I have also heard good things about the Garmin :) Good luck!