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Many studies have evaluated factors associated with the athlete (intrinsic) and factors that are external to the athlete (extrinsic) for their relationship with hamstring injury. Over time these intrinsic and extrinsic factors have been examined across a large spectrum of athletic populations with varying degrees of rigour and consistency. Recently the value of much of the risk factor literature has been questioned, owing to several notable shortcomings: (1) the low quality of many studies, (2) the conflicting findings between studies, (3) the failure to recognise the interactions between risk factors, and (4) the dynamic nature of risk profiles within and between athletes. Increased chronological age and a history of previous hamstring strain are commonly, although not consistently, identified factors that place an athlete at a greater risk of hamstring strain. These non-modifiable risk factors (age and previous history) can …