Anything taken at the Enhanced Games, Magnussen says, “has to be FDA approved and prescribed by a medical professional”. His drug of choice is testosterone: “something that’s produced naturally in our body and that declines rapidly from our late twenties onwards”. That decline, Magnussen says, is a “leading cause” of “lower libido, lower energy levels, low mood” and “a decrease in muscle and strength”. In short, the male menopause. What the sportsman leaves out, or perhaps hasn’t been told, is that testosterone supplements, when taken over many years, only accelerate the condition he describes.