Best of Boston

You haven’t truly tested your willpower until you’ve eased into a brisk 50-degree tub. Cold plunges may be trending, but at Release Well-Being Center’s Back Bay outpost, the practice feels purposeful, not just buzzy. The contrast-therapy experience pairs the coldplunge with a 150-plus-degree sauna, encouraging guests to alternate between extremes to boost circulation, reduce inflammation, and spark a serious endorphin rush. The environment is tranquil and thoughtfully designed, even if the water hits like a thousand tiny ice cubes. You’ll leave energized, clear-headed, and maybe just a little hooked.