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That's a good bargain if u just started with health gadgets. This Flex version is best for beginners & intermediate users. If heart monitoring & GPS tracking are very important then go for higher grade version. If your smartphone is able to install Fitbit apps, got Bluetooth & Wi-Fi/3G/4G connection to internet, u r ready…
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Seek an assessment from a chiropractor. U could have some physical imbalance that cause the posture problem.