The correct answer Is B I’m 80% sure
I don't know much but I'll try to help. I would recommend doing a workout for a certain amount of time maybe like 15 minutes. Every 15 minutes set a time for a quick break like maybe 5 minutes (So basically work out 15 minutes and take a quick break then repeat). You can also try exercising different times during the day like a bit in the morning, afternoon, and night so you don't have to do a bunch during a long period of time.
The doctor. most likely, is referring to the settling process. In this process, the muscles are still adjusting or on the process of healing so he is experiencing some back pains due to this. Once the muscles are settled in place, he would feel normal again.
