Second, I would argue that as a world class athlete he has the "Remarkable athlete" ability which would make his base jump 25 feet with a 20 strength.
Finally the jumping rules are for jumping with no skill check and the rules afford an option to jump further with a skill check. I would argue the 29 feet is more than his normal jump distance and he made a good skill check to do that.
So if I had to boil it down, I would say he has an 18 strength and remarkable athlete giving him a base 21 foot jump. He also has expertise in athletics for a +16 to the skill. 29 feet is probably about a 30DC, so he rolled well and made that 29 foot jump. With a poor roll it would have been 27 or with no roll 23.