By Tanner Garrity Among the many numbers that sum up Lance Armstrong’s illustrious, controversial career, there’s one that feels even more mythic than his seven Tour de France titles. At the peak of his powers, the cyclist reportedly had a resting heart rate of 32 beats per minute. Is it true? That’s slightly unclear — the stat appears to have been listed on his website at one point, detailing a range of 32-34 beats per minute. Other once-in-a-generation talents have had similar BPM buzz over the years; Usain Bolt apparently averaged 33 BPM when he was setting world records in the 100 and 200 …