About Us

We were amazed at how many different fitness concepts are offered on the market today and how people are judged solely on the basis of their physical condition without knowing the importance of the psyche.

Each customer is addressed in the same way and treated equally. Every gym offers different activities, but as a trainer it often takes a long time to figure out what motivates and demotivates customers. We are now launching a concept that also integrates people’s sports psyche. This allows the trainer to adapt to each customer individually.

We look forward to supporting you.

Tanya Laumen-van Doorne / founder

Tanya is founder of YET Holding. She has been working successfully in the field of psyche, health and nutrition for years. YET was developed from her expertise in MBTI (the world famous psychometric tool).

Dennis Gellert / co-founder and director

Dennis is co-founder and general manager of YET AG. He has been passionate and successful in sports, health, personal training, sales and marketing for over a decade. As General Manager of YET AG, Dennis is responsible for Switzerland, Germany and Austria.

The story behind YET (Your Exercise Type)

Decades ago, the famous Carl Gustav Jung from Switzerland investigated the differences between Personality Types. Two pioneers, named Myers and Briggs, where thrilled about his theory and introduced something new based on the complex psychological theory from Jung. A theory which everybody could use and understand, something simple. So, something simple was born, an instrument you can use to understand the differences between people, The Myers Briggs instrument. This instrument was introduced to the world in 1962.

Since then a team of psychologists, researchers and thinkers have evolved, who built this instrument out through modern psychometrics with the intention of delivering actionable guidance for personal and professional growth. MBTI gives you the opportunity to gain insight into yourself and easily understand others. The MBTI questionnaire is offered in 29 languages and is used by 88% of the stock listed companies globally. Understanding yourself leads to a more self-aware and satisfying life. But also understanding others leads to more connection with others. It influences your perspective as a ‘people-first’ thinker and will make an impact in your live. Since then a lot of researchers found new opportunities to use this MBTI tool for other purposes. For example, how can you use this MBTI instrument to make progress concerning your own health?Researchers and writers Nancy Shaubhut, Rich Thompson, Suzanne Brue, Heather Jones, Mary Miscisin and Roberta Schwartz Wennik wrote books and articles about how you can use MBTI in this specific area. 

And now YET is born. YET carefully developed a special exercise program based on the research of Nancy Shaubhut, Rich Thompson and also Suzanne Brue, who developed the 8 Colors of Fitness and Roberta Schwartz Wennik who has wrote many books in this field. So, learn more about yourself and how you can use your type to achieve better results with less effort. 


Original research:   Thompson, R., & Schaubhut, N. (2017). The impact of personality, gender, and exercise on job satisfaction and turnover intentions. Presented at the EAWOP annual conference, Dublin, May 2017.

1 Thompson, R.C. & Hackston, J. (2018). Personality, exercise, job satisfaction and turnover intention: Are they related? Poster presented at the BPS DOP annual conference, Stratford-upon-Avon, Jan 2018.

2 Lechner, L, & de Vries, H. (1997). Effects of an employee fitness program on reduced absenteeism. Journal of Occupational & Environmental Medicine, 39(9), 827-831.

3 Jacobson, B.H., & Aldana, S.G. (2001). Relationship between frequency of aerobic activity and illness-related absenteeism in a large employee sample. Journal of Occupational & Environmental Medicine, 43(12), 1012-1025

4 Wattles, M. G., & Harris, C. (2003). The relationship between fitness levels and employee’s perceived productivity, job satisfaction, and absenteeism. Journal of Exercise Physiology, 6(1), 24-32.

5 Robison, J., & Rogers, M.A. (1994). Adherence to exercise programmes. Sports Medicine, 17(1), 39-52.


  • ‘Gifts Differing: Understanding Personality Type’ by Isabel Briggs Myers
  • ‘A Diet for every personality type’ by Roberta Schwartz Wennik
  • ‘What’s your diet type?’ by Heather Jones
  • ‘The 8 Colors of Fitness’ by Suzanne Brue
  • ‘Your personality lifestyle’ by Roberta Schwartz Wennik