a flys fart under 6foot - with a very small bone structure and really long legs - sitting upright, my fingers only just pass my knees (most people get at least half way)
Also i should note - relating to my ranting somewhere above - these “trainers” typicify interval training as in - Flat out for 10sec then 2min off walking slowly and repeat. Not the Tempo we know on Cf.com which is largely aerobic based.