I saw pictures of him and he was kind of a small man wasn’t he, so he could have been a jockey.
Lots of reasons for leg cramps SG., fatique, exercise, too little salt, too much salt, the list is endless ( I looked it up) so no reason for panic. I only had mine done because my Mom was after me to get it done, ours is hereditary, my doctor gave me 6 months to see if I could do it on my own with the help of a dietician, she cut out pretty well everything I was eating, I was down to lettuce and water,
in the end , no amount of exercise and diet would lower it to a healthy level. I take Crestor, which by the way, one of the symptoms of that is sore muscles, mine tend to be in my upper arms sometimes. 