How do dolphins stay fit?

Answer 1

As dolphins exert themselves significantly as a matter of course, staying fit is not a problem. Dolphins are very active and burn lots of calories playing, hunting, and travelling; the difficulty lies not in remaining fit, but in meeting those high-maintainence energy needs. Unlike humans, who sometimes adopt a sedentary lifestyle simply because we can, dolphins will not sit still for want of anything to do; they get all the exercise they need from daily life, just as they have adapted to do over millions of years.