If you heard me say, ‘red light, green light’, you’d be forgiven for thinking I was talking about the infamous Squid Game challenge. But no, I’m referring to my two favourite LED colours ...

Let’s use a simple traffic light to create a strategy: three lights, four decisions. Green light: You are regularly or intermittently active with no aches or pains (lucky you).

The yellow light would not come into play until the 1920s. William Potts, who was a police officer in Detroit, is credited for designing the first three and four-way colored traffic lights.