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Yes there can be serious downsides and side effects especially if you have heart disease - google it. There is limited peer reviewed evidence that it has any benefit to joints. Fish oil, if you take the right amount has much more beneficial impacts on the whole body including joints
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Same thing happened to mine. I changed the battery in the chest strap and all is good. Make sure you take the transmitter off the chest strap to maximize battery time
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Lunges and squats with or without weights