This is a question of Physical Education

A) Do you think that whenever we do an activity we should do a warm-up before? Why?

Yes. To get all muscles and tendons and ligaments stretched. so you wont get hurt.

Whenever we do an activity we should do a warm-up before because the body is relaxed.

The muscles are relaxed. If you start an activity wirhout warm-up the muscles or ligaments and tendons can be severly damaged. Therefore, you need to do first lights movements to warm-up the body