Have you seen all the people using cold tubs? If you believe the claims, jumping into a bucket of ice is one of the best things you can do for your body. But if you look at the research, there's a big disclaimer you don't hear mentioned very often. On today's episode, Arnold shares what you want to keep in mind before you do a full-body freeze. You'll also learn about how intense exercise can help protect your heart, and the surprising way to improve the quality of your sleep.

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