text: patellar tendon moment arm ( þ 18%). Therefore, of these two 
  key strength determinants, muscle size, rather than joint lever- 
  age, appeared to be the predominant factor responsible for the 
  WSM’s extraordinary strength. Indeed, when we previously 
  compared the muscle morphology and joint mechanics of indi- 
  viduals with distinct maximum strength capacity (long-term 
  resistance-trained individuals vs. untrained controls), muscle 
  size was the primary factor separating the groups with much 
  more subtle differences in moment arm (10). The extreme 
  example of muscle size provided by the WSM’s quadriceps  femoris also gave the opportunity to investigate the scaling of 
  tendon size to muscle size; extreme muscular size (greater 
  than or equal to twice that for untrained controls) might be 
  expected to be accompanied by comparable tendinous tissue 
  size to effectively transmit high muscular forces to the skele- 
  ton. However, the WSM’s patellar tendon CSA was only 30% 
  larger than untrained controls and within the range of indi- 
  viduals we have previously measured (Fig. 6A). This obser- 
  vation supports the notion that tendon structure may be 
  largely ﬁxed by adulthood (40), with only slow/limited 