Can You Move in Medieval Armour? An Experiment in Mythbusting - Medievalists.net
Many believe the myth that medieval armour was hard to move in. However, with Boucicaut as an example, our video proves that late medieval armour allowed for surprising mobility.
The armour was custom fit to the wearer.
The knights and men-at-arms were very athletic and well trained professional soldiers similar to today's Marines.
Strong and fit from lots of physical labor and training. Not made soft and weak from all the modern conveniences we have today.
You can go to any Renaissance Fair and watch them joust and duel in their armour and see how they move.
And these modern "knights" still aren't as hardy and rugged as the men who wore it centuries ago.