text: Yo, check it out, here's the lowdown,
  This article drops results from a field test, yo,
  30 male farmers, ages 15 to 54,
  Work capacity on display, we explored.
  
  They took a self-paced walk, from the valley floor,
  Climbed that mountain wall, then came back for more,
  Monitoring heart rates, keepin' it real,
  2.21 km route, that's the deal.
  
  The rise was 200 meters, pretty steep,
  Grade at 34 degrees, no time to sleep,
  Steps cut into the mountain face, no joke,
  These farmers pushin' boundaries, goin' for broke.
  
  The aim of this research, let me make it clear,
  To understand how these traits affect the cash they bring near,
  Anthropometry and work capacity they gauge,
  To see if it impacts their household's economic stage.
  
  Income per productive adult saw an incline,
  Fitness index rose, yo, things were lookin' fine,
  Heart rate increase above restin', that's the key,
  Multiply it by the time, that's their fitness spree.
  
  But hold up, rice bundles earned per family,
  They didn't correlate with fitness, actually,
  Number of household adults and sitting height,
  Those factors played a role, yo, that's right.
  
  Adjusted R-squared at 0.392,
  That's the stat, makin' sense of this view,
  So there you have it, published back in 2000,
  Am. J. Hum. Biol., Wiley-Liss, representing the crew.