You need to eat healthy, exercise daily, take brisk walks and do the daily chores of habitual.
You can get obese and than u would become lazy
I believe it is Fast-twitch muscle fibers. Slow-twitch fibers are used for people who exercise for a long period of time such as running, swimming, and cycling.
Heavy weight lifting is fitted on Anaerobic Activities
Heavy Weight lifting is considered short lasting-high intensity training which relies on on muscle strength rather than cardio vascular capabilities ( if it relies on cardio, it fitted on Aerobic Activities)
other Examples of anaerobic activity : Pull ups, Bench Press , Push up, etc