Question

who are going to give a talk about keeping fit

Answer 1

учителю или однокласснику

Answer 2

If you want to be beautiful, successful and healthy you should take care of yourself.If you get used to the  morning  execises, morning procedurce such as cleaning teeth and taking a shower , it will good for you. 
A healthy lifestyle is more popular nowadays because everybody want to keep fit. if you want to be healthy you should  keep a balanced diet, do some sports and check in yourself at the doctors regularly. cycling and skating are popular in my region. 
как то так, добавь побольше слов если что сама