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.The man focused heavily on his legs when working out at the gym. Photo: HandoutHis doctor, nephrologist Liu Haofei at the First Affiliated Hospital of Henan University of Chinese Medicine, said he was “trying too hard” in his leg training, which caused rhabdomyolysis.