When I first heard Gareth’s work on training prescription with anaerobic speed reserve, it was hard to digest because it was so culturally opposite to what I’d learnt about training. After 18 months of consultation with him, I have vastly transformed my thinking about individualizing training and aerobic conditioning. In a recent 12-week block with female referees, we have seen improvements as large as 40s on their 1600m time trial (for maximal aerobic speed assessment). I cannot thank you enough, and would highly recommend to any colleagues that want big improvements in their athletes conditioning season after season.