Another very simple technique is what I call active conditioning. This is where you start whatever workout you normally do in one environmental extreme or another. I often will go running in just shorts and sneakers during the middle of winter, when snow has blanketed the Colorado landscape. I do a 3-mile run around a lake near my house without a shirt on while other brave souls are clad head to toe in fleece. Heads turn and most people will think I’m crazy, but anyone who has even a modest running habit knows that once they get moving their core temperature spikes upward. Those fleece-clad
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