由于我不知道你要几个原因，所以我先给你2个原因，如果要多还是少我再更改
你可以写： It is healthier for us to exercise during the day than at night because we will probably be more consistent. Besides, it's less likely to affect our sleep schedule. 参考答案：https://www.shape.com/fitness/tips/which-better-am-vs-pm-workouts
One recent paper indicates that morning exercise may activate certain genes in the muscle cells, boosting their ability to metabolize sugar and fat. While scientists say this finding requires further study, they think it ultimately might help those who are overweight or suffering from Type 2 diabetes.
An evening workout, on the other hand, uses less oxygen, making workouts more efficient and improving athletic performance, potentially a boon for serious competitors.
最近的一篇文章指出,晨练可以激活肌肉细胞中的某些基因,提高它们代谢糖和脂肪的能力。 虽然科学家说,这一发现需要进一步研究,但他们认为,它最终可能帮助那些超重或患有2型糖尿病的人。
另一方面,晚上的锻炼会减少氧气,提高锻炼效率,提高运动成绩,这对严肃的竞争对手来说可能是一个好处。
参考：https://www.washingtonpost.com/health/whats-the-best-time-of-day-to-exercise-morning-or-evening/2019/07/19/b202a674-9f50-11e9-9ed4-c9089972ad5a_story.html
