The Solutions
The obvious solution is not to buy one. Meanwhile, not all fitness trackers are a security threat, the most important thing is to purchase one from a reputable company and know your security setting and if the information is encrypted. Some companies are taking huge steps in regards to protecting your privacy. Samsung, for example, has introduced "KNOX", if an attempt to access your data, without your consent, your device will lock out of the health app to keep your information safe.