The brown color comes from excreted myoglobin, resulting from the breakdown of skeletal muscle. An impressive specimen, made moreso because it resulted not from major trauma but from participation in a squatting competition.
Xiao Tang, a 19-year-old sophomore at a college in Chongqing, China, was not used to exercise. This, combined with an apparent competitive streak, led to her being hospitalized when she got into an exercise fight on a video chat with an equally competitive friend... "We both did not want to lose and so we kept trying to beat each other," she explained. Neither of them willing to back down and stop squatting first, they both ended up doing over 1,000 squats.The other girl also got rhabdo. Brief discussion at the link re her rx and the risk of renal failure.