What is the most recent academic based definition of exercise

Thank you everyone. You have all contributed valid thoughts and have benefited towards my essay on whether exercise is a mind body wellness technique. There are so many angles that one could approach this from, however I have always believed that the mind and body are totally integrated, which brings in Karin’s quote of “Mens sana in corpore sano”, and would extend it further to say a healthy mind in a healthy body in a healthy body, as it never is a one way action, but rather a cycle.
Thank you all.
Liz x