Everyone these days wants to optimise their workouts, but when a study seems too good to be true, it usually is Prof Devi Sridhar is chair of global public health at the University of Edinburgh We live in an increasingly polarised world – and I’m not talking about politics, I’m talking about exercise. There’s a fitness community obsessed with constant optimisation and hacks : how can you get from 50 press-ups to 100, from an eight-minute mile to seven minutes, or increase your deadlifts from bod