Back in the late 70’s and 80’s top squash was seen primarily as an aerobic sport, with intermittent bursts of speed and power. Tales of Jonah Barrington’s and Geoff Hunt’s attritional matches were of legendary status – and I was there in Toronto when Jahangir Khan effectively dethroned Hunt by grinding him down to the point where he literally could not move (I think he also threw his racquet for the first time if my memory is correct?). I regularly went on six to 10 mile runs, and for several years worked my way up to 24, four hundred metre intervals at the start of every season.
Amongst our Toronto group, there was talk of New Zealand’s Murray Lilley (working in Calgary at the time?) going out and running a 2:23 marathon with little or no specific running training (over and above what he would do for squash). At our Squash Canada National Team Training Camps (I was there as the mental training consultant), players such a Jamie Crombie, Gary Waite, and Dale Styner were all pulling VO2 Max scores in the low to mid-seventies, which were equivalent to the Olympic Marathoners at the time. (Note that these scores might be due to misguided training and tactics versus the actual demands of the game and “smart” tactics). My opinion at the time was that the physiological profile of a top player was very similar to that of a 10K runner.