The prototype of the shoes that Eliud Kipchoge used when he first ran a marathon for two hours has been banned. But other shoe models of the new, performance-enhancing kind may still be used. That's Yannick Tregaro critical of.

- There has been little technical development with shoes and even tracks, but that development has not been as significant as it is now. There are clear and big differences in the development now, he says.

- The boundary must be set much, much harder, so that it does not become unfair. And it's really up to World Athletics (International Athletics Association).

"A very boring development"

Tregaro says it is working to get the corresponding footwear for jump branches and sprint distances. He is afraid it will hurt the athlete's soul.

- Broadly speaking, athlete's soul is about human development. How fast you can run, how far you can jump, how high you can jump. The world record in high jump is a measure of human capacity, how high one can jump. That's what I love about athletics. If Thobias Montler's record is 8.22 and then he suddenly jumps 8.40 because of a pair of shoes that is better then it is a very boring development, says the coach.

Tregaro: strike the record

Shoes have always been developed, but Tregaro believes that the new models are unique in the sense that everyone gets the better of them. In the past, it was more about the relationship between individual and shoe.

Yannick Tregaro is clear with what action he wants to see from the international federation:

- I think that World Athletics should look over all the world records that have been set for the past three years and delete everyone who is set with those shoes. The national unions can do the same with their national records. I think the record should be deleted and that the boundary of what shoes should look like must be much clearer and stricter.

- I realize that it is very complex and difficult to put a limit on this, but it has to be done.