In 1932 the Open was held at Princes' which played to 7060 yards.
In 1932 Craig Wood, one of the longest players of the era, won a long drive contest averaging 247 yards over three drives. (His longest was 255.)
In 1932 the swing speed of Jim Reynolds, the "national driving champion" (whatever that means), was measured on a new GE machine at 125 mph.
These facts led to several connected thoughts:
First, if you want to hold an Open today that plays as long as the Open at Princes' in 1932, it would have to play at about 8500 yards. And that's being conservative.
Second, courses today at 7600 yards for major tournaments are not long in relative terms. They are in fact short, historically.
Third, not many players today - even the longest - have clubhead speeds exceeding 125 mph. However stronger, more limber, fitter, bigger and taller players may be in 2006, there were apparently a number of players in 1932 who could swing the cluhead as fast as the longest players today.
Fourth, all this compels the conclusion that the enormous gains in distance since 1932 (and "enormous" understates things) have mostly to do with changes in technology and very little to do with physical fitness.
Bob