An interesting reference I found about knightly training, but mildly suspicious in my mind.
Jean Boucicaut was a French Marshal who lived during the Hundred Years war. His adventures led him from the mountains of Hungary, to Turkish prisons, from Constantinople to the north of Italy. He was at Agincourt and captured and died in captivity in England. This is all true and accounted for.
An anonymous account of his life was published in 1886 and a small portion covers his training as a knight. The biography was used in Barbara Tuckman's 'A Distant Mirror' and Kottenkamp's 19th century work on the history of chivalry and armor.
Here is a summary of the things Boucicaut did according to the anonymous biography. There is much leaping involved.
1 - While fully armored he leaped on and off his horse without assistance.
2 - He ran great distances in armor to build up his endurance.
3 - With an axe or mace he delivered strikes to a thick logs or a block of stone. (The wording here is taken from my text-source.)
4- He did many leaps while in armor.
5 - He leaped upon his horse in armor while the horse had no stirrups.
6- He danced in his hauberk. (No explanation is given)
7 - He would vault onto the shoulders (unarmored it appears) of a tall man on a horse with no help except grabbing the man by his sleeves. (?)
8 - With one hand on the pommel of the saddle and one hand on the ears of a charger, he'd leap over it.
9 - He'd, unarmored, find two narrow walls and scale up them using his legs and arms.
10 - He'd climb a ladder upside-down. Unarmored he did this one handed.
11 - He and his squires practiced the art of 'darting the lance' (no explanation given).
The book this comes from is 'Anonymous, Le Livre des faits du bon messire Jehan le Maingre, dit Boucicaut. maréschal de France et gouverneur de Jennes.'
It's in French and I can't find much else on it- but thought I'd share.
The memoirs of the Duke of Sully, first translated into English in 1775, supposedly gives an intimate account of the life of King Henry IV of France, including some of the training he did in armor. Alas, I could not find anything specific beyond a few oblique references to the book and what it contains. Perhaps of use for the truly scholarly sorts in HEMA!

