text: ﬂexors, potentially placing a higher demand on the contract- 
  ile apparatus than for running and jumping tasks. 
  
  Considering individual muscles/compartments, the mus- 
  cular development of the WSM was distinctly nonuniform. It 
  is striking that the largest muscles relative to the untrained 
  control population were the three “guy ropes” (sartorius, gra- 
  cilis, and semitendinosus: þ 140–202%). These three muscles 
  provide stability to the pelvis and femur by having origins at 
  diverse points around the pelvis while sharing a common 
  insertion onto the anteromedial tibia [via pes anserinus, the 
  conjoined tendons of these three muscles (39)]. Large guy 
  rope muscles likely enhance stabilization of the femur and 
  pelvis and would be expected to be critical during heavy 
  weight-bearing tasks. In contrast, the WSM’s ﬁve smallest 
  muscles (relative to untrained controls) consisted of two hip 
  ﬂexors (iliopsoas and RF) and two monoarticular knee ﬂexors; 
  actions that appear far less important for lifting, carrying, and 
  pulling tasks. 