Answer:
I found this off of google "Regular exercise and physical activity promotes strong muscles and bones. It improves respiratory, cardiovascular health, and overall health. Staying active can also help you maintain a healthy weight, reduce your risk for type 2 diabetes, heart disease, and reduce your risk for some cancers."
But to me physical exercise is important because if you didn't exercise then you wouldn't be able to do anything fun. you would just be sitting around all day. But that is just my opinion of why physical exercise is important.
Hope this helps!
Have a great day and stay safe! :D