Natural light helps to regulate your biological clock so exercise outdoors if you can.

自然光有助于调节你的生物钟，所以如果可能的话，到户外去运动。

youdao

Walk and exercise, walking to hard. Sit like a clock, standing like pine, line is like the wind.

走路也是锻炼，走路要用劲。坐似钟，立似松，行似风。

youdao

When choosing a time of day to exercise, paying attention to your body clock can improve results.

在选择每日锻炼时间的时候，关注生物钟能提升锻炼效果。

youdao

He counsels people that the best time to exercise is the one that works with their body clock and fits with their schedules.

FORBES: Best Time To Hit The Gym