Jens Bangsbo, PhD Scient, has published more than 300 scientific articles and numerous book reviews and chapters and has written more than 25 books in the field of exercise physiology and football, most of which have been translated to more than ten languages. He is a former professional football player with more than 300 matches in the top league in Denmark and has played on the national team both as a youth and senior player. He has coached at the highest international level in football for Juventus FC, AEK Athens and the Danish national football team, and is currently part-time coach of the Italian club Atalanta. He is a UEFA pro-license coach, FIFA, UEFA and AFC instructor. Casper Skovgaard, PhD, has written a number of scientific articles and has worked as a football coach and fitness coach for a number of years. Casper is currently running the company SoccerFitness, which he started with Jens Bangsbo in 2018.