Testing her theory, she asked men and women to hold high or low-power poses (making themselves small or touching their necks) for two minutes, then measured the changes in their testosterone levels. Those in the low-power stance experienced roughly a 10 per cent decrease. An excuse to keep manspreading, then.

Anabolic Steroids

This one’s a bit confusing, given their popularity among bodybuilders seeking quick hits of testosterone. But the effects of anabolic steroids are short-lived.

According to the journal PLOS One, loading your muscles with artificial strands of the hormone tricks the body into thinking it has produced enough naturally. Inject too much, and the slowdown can become permanent.