==Confusing and incomplete== 
 The textual context to the definition is inaccurate, incomplete, and misleading. The article first states the MET has units (power)/(kg). I would guess that the (power) is either: the body's output power or the energy burned per unit time. These are different! The definition does not state which to use. Also, the (kg) is not defined. I would guess the (kg) is intended to be body mass, but again, this is not stated.  
 The next sentence says the MET is also defined as (power)/(m^2), where the (m^2) is body surface area.  
 These are two different definitions! There should be a discussion on the differences: "Some authors [...] define a MET as power produced per body mass; other authors [...] define a MET as power produced per body surface area." Or something along those lines.   — Preceding unsigned comment added by     

 : moved this comment to the end as per wiki protocol.  It seems to add to my remarks above.  Should it be indented?