A simple question from a tennis coach led to the development of an award-winning solution for tennis players
Every string naturally loses tension over time, regardless of whether you play or not. This fact led to Sander van Heijst’s development of the Retenser. He personally witnessed the equipment’s impact on his tennis game during his professional international tennis career.
Sander has been a tennis coach for over 25 years, often recommending that tennis players replace their strings. Lack of time is a commonly cited counterargument. Consequently, many tennis players continue to use old strings for too long. Sander pondered why it’s possible to instantly tune a guitar but not a tennis racket. This question inspired Sander to create the Retenser. He built the initial prototype himself and was very satisfied with its impact on string tension. Subsequently, he collaborated with a design agency to further develop various prototypes, leading to the creation of the Retenser