Re: Question
Don't knock toddler's motor skills. From a college textbook on child development, I read about an experiment where adult volunteers in peak physical condition (I believe they were recruited from an armed forces unit) were tasked with copying all the physical movements of toddlers at play. The grown ups lasted something like 20 minutes before they were exhausted.
(Granted, there's stuff like the square cube law at play, plus a distinction between motor skills and stamina)