Justin Mullner, a 40-year-old doctor, emptied his family’s two ice makers into the bathtub at his home in Orlando, Fla., added cold water, checked the temperature with a thermometer, stripped down to ...

While you’ve probably seen elite athletes like Michael Phelps and Serena Williams climbing into giant vats of ice water, you don’t need to be an ultramarathoner to reap the benefits of this recovery ...