Since his return from Australia, Jacco Verhaeren, the former national coach of the Dutch swimmers, has been busy. The Tilburg company FluxPlus has developed a unique method with which the physical performance of people can be optimized. This system is called chrono coaching and can make the difference within top sport. Verhaeren explains: “It is sour to see that an athlete is in top shape at some point but is losing his lead due to jet lag, reduced sleep quality or an incorrectly synchronized sleep / wake rhythm. Chrono coaching can make a difference in top sport here, just as it can for the physical and mental health for everyone inside and outside the sport.