The protein flapjacks Joe wicks advocates were first posted on his Instagram back in the day before the body coach became a household fitness name. In fact, it was 2014. Six full years before we all started bunnyhopping around our living rooms and having ‘how low can you go’ squatting competitions with our kids. Just us? Yet even before the heady days of Lockdown Mark 1, protein flapjacks were celebrated like the return of a long lost prodigal child. Why?…