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One thing to consider: Your core temperature is lower in the morning, so if you work out at that time, make sure you warm up properly before jumping into rigorous exercise. Your body tends to be warmer in the late afternoon and evening, which corresponds with greater performance, researchers say. What about exercising at night? It really depends how late you’re planning. A recent study by the National Sleep Foundation found that, compared to non-exercisers, people who work out are more likely to say they sleep well no matter when they broke a sweat. But remember that your internal body temperature cools at the end of the day to make you sleepy. A big sweat session at 10:00 or 11:00 will likely affect your sleep and throw off your body clock.
Adapted from the Women's Health Body Clock Diet