What tissue in the human body has the unique ability to grow in size with regular exercise?

This can be muscle tissue. Under stress, muscle fibers are torn. After a while, they are restored in greater quantities. This is how many athletes increase muscle volume. Also, after exertion or lifting the bar, anyone will notice that the muscle volume has increased. In a few minutes they will return to their original size. This effect appears due to blood flow during exercise. Blood delivers more oxygen and nutrients to the muscle cells so that the muscles can function.