A young Chinese man suffered acute kidney failure after working out too intensely, prompting a doctor to warn fitness enthusiasts to slow down. The 23-year-old university student from central China’s Henan province reportedly developed rhabdomyolysis, a serious condition where damaged muscle fibres break down rapidly. He was also diagnosed with acute kidney failure, which is a complication of rhabdomyolysis. The reason behind his acute illness was fitness training. His doctor, nephrologist Liu.