The pulse intensity should not exceed 120 per minute, and the time should preferably exceed half an hour, otherwise the effect will be very small.
Be sure to be prepared for activities and keep warm. If you are in poor health, don't do morning exercises. If you are not excited in the morning, blind morning exercise will easily lead to shock and sudden death.
I'm not sure about the sunrise, and there is no data to show that I can't do morning exercises.
In addition, morning exercise has nothing to do with losing weight, mainly fitness. The best time to lose weight is 4-5 pm, usually after work, pay attention to diet.