First, lack of exercise at ordinary times, once excessive exercise leads to muscle strain.

Second, the weather is too hot and you are too lazy.

In fact, it is good to get up a quarter of an hour in advance every morning and do some basic warm-up exercises. It will naturally become a habit to stick to 1 month. There is a consistency in movement. Once you stop halfway, you may become lazy and don't want to continue.

Me too ~ ~ ~