Channel your inner adventurer. You may have seen “Nyad,” the Netflix film about Diana Nyad, in which the American distance swimmer (played by Annette Bening) swims to Florida from Cuba outside the protective confines of a shark cage — at age 64. “I don’t believe in imposed limitations,” she says matter-of-factly in one scene. And… Continue reading Fitness challenges for the new year: long walks, steep hikes