Having practiced submission wrestling and bjj for years - it is incredible strenous and requires conditioning to handle at all.
Judo, with it’s focus on grappling standing up is ridiculously hard on the body, and is not something you just pick up late in life and chill with. You’d break in all sorts of ways.
Carmack seems to have a serious interest, starting with wrestling in highschool.
> My wife for Christmas once got me a year of privates with Carlos Machado which put me up several levels. There was a period there where I’d have Judo with one of my coaches one day, then privates with Carlos the other day.”
While working at Bletchley, Turing, who was a talented long-distance runner, occasionally ran the 40 miles (64 km) to London when he was needed for meetings, and he was capable of world-class marathon standards. Turing tried out for the 1948 British Olympic team, but he was hampered by an injury. His tryout time for the marathon was only 11 minutes slower than British silver medallist Thomas Richards' Olympic race time of 2 hours 35 minutes. He was Walton Athletic Club's best runner, a fact discovered when he passed the group while running alone. When asked why he ran so hard in training he replied:
I have such a stressful job that the only way I can get it out of my mind is by running hard; it’s the only way I can get some release.
That doesn’t say he ran back, to, though. Maybe call that a half-commute?
Alan Turing ran a little while he was at Sherbourne school, usually when football was cancelled because of bad weather. He did not run while an undergraduate at Cambridge, preferring to row, but once he had won his fellowship to King's College he began to run more seriously, his frequent route being from Cambridge to Ely and back, a distance of around 50 km. He did a little running while at Bletchley but only when he moved to the National Physical Laboratory did he take up running more seriously