Salto-
Oldfield was an incredible athlete who could do unheard of things but 12'6" is about the most amazing feet I've heard from him. Where did you hear about the mark?
I heard about it from our shot put coach at the National Sports Center. I just looked it up and the mark I found on Oldfield is 3.68 m (12'1").
Gunthor – "A shot putter has to be a good jumper. I have been a good jumper from
the beginning and now I can jump 3.60 m in the standing long jump (Gunthor
stands 2.00 m high and weighs 127 kg). His standing long jump distance is the
second best ever achieved by a thrower. (Brian Oldfield of the United States
jumped 3.68 m)"
https://72.14.253.104/search?q=cache:4UCWjybHajoJ:www.athleticscoaching.ca/UserFiles/File/Sport%2520Science/Theory%2520%26%2520Methodology/Throwing%2520Events/Shot%2520Put/Poprawski%2520SP%2520Training%2520-%2520Remarks%2520of%2520Champions.pdf+Brian+Oldfield,+%22standing+long+jump%22&hl=en&gl=us&ct=clnk&cd=2
and also:
"According to an end of February 2003 issue of Sports Illustrated (not sure which week) Brian Oldfield could put the shot 75 feet, high jump 7 feet, run the 100m in 9.5 and I found a reference to a 3.68m STANDING long jump. So far as I know, Oldfield remains the only 75 foot shotputter/7 foot high jumper on the planet. ABSOLUTELY INCREDIBLE."
Posted by: David E. Ortman | July 27, 2006 8:12 PM
https://masterstrack.com/blog/000921.html
I don't think marks like this are all that improbable for shot putters the size of grizzly bears. Aren't world class Olympic weightlifters known to be able to beat world class sprinters across 20-30m? SLJ is one single explosive effort and these guys (shot putters) train for explosion from a crouch. Plus he was pretty tall…
"At 6' 5" and 280 lbs., Brian could power clean and jerk just under 400 lbs., push-press 315 lbs. 5 times and run a 4.6-sec., 40 yard dash!" By Jeff Everson https://www.xtremebodyshop.com/articles/articles04/powerlifting/samsons.html