Research & test lab of AUGMANITAI — nothing is sold here
ballscience4u.
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The performance lab of AUGMANITAI — sport science in practice

Andreas Ehstand Science meets Court.

AI-supported performance coaching for tennis, padel, pickleball and golf — sport science practiced by a sport scientist.

Tennis
Padel
Pickleball
Golf

Why this concerns you: If your technique already looks fine but your results still don't move, the missing piece is usually invisible — this is where we make it visible.

Three straight answers

What is it?

AI-supported performance coaching for tennis, padel, pickleball and golf: performance factor analysis and mental sports coaching to the GPTCA/ISMCA standard.

Behind it: Andreas Ehstand, sport scientist and AI Scientist, who links the coaching practice to the AI assistant Phöni and to his research programme AUGMANITAI.

Performance factor analysis for tennis, padel, pickleball and golf. Individual and group training, association and university support, club and high-performance sport, career planning.

What's in it for me?

Over 15 years of international coaching experience, plus AI-supported motion analysis with Phöni — for example one player's documented rise from LK2 to DTB 150 in six weeks.

One documented example: a player rose from LK2 to DTB 150 in six weeks — see the Performance Lab.

Why is it worth it?

Recognised by internationally established coaches such as Tomáš Šmíd and Hernan Flores, trained in the Toni Nadal Excellence Programme — the result is documented, measurable progress over weeks.

There is no price button, because every engagement is tailored individually to location, duration and scope: exact terms are clarified in a personal conversation.

Experience it first

The same physics. Four different flights.

One physics, four sports — to touch.

A visual physics model — not a measurement.

gentlefull
nonemaximum
flatsteep
Andreas Ehstand hitting a ball, still frame
Between the strokes
The difference between good and great lies in making visible what happens between the strokes.
Recognition from international coaching

Names that speak for the work.

Toni Nadal Excellence · GPTCA/ISMCA

The quotes below are reproduced verbatim in their original German — nothing translated, some shortened for length, never altered.

Documented credentials — the hard facts

Toni Nadal Excellence Programme (Rafa Nadal Academy)

Toni Nadal Excellence Programme (Rafa Nadal Academy). Nine-month intensive programme with 30 years of Toni Nadal experience: technique, footwork and motivation. Since September 2018 in D-A-CH: the Excellence diploma — Toni Nadal's highest coaching programme. Excellence: Rafa Nadal's uncle and GPTCA co-founder — opens his complete methodology for performance coaches.

GPTCA / ISMCA Tennis Mental Coach

GPTCA / ISMCA Tennis Mental Coach training (Alberto Castellani, GPTCA – Global Professional Tennis Coach Association).Alberto Castellani, GPTCA – Global Professional Tennis Coach Association).

Tennis racket with a glowing data trail, still frame
The science behind the racket
Technique alone is not enough. We analyse movement, posture and language.
Method

Biomechanics and AI motion analysis.

At BallScience4U we work at the intersections between tennis, padel, pickleball and golf. Each discipline has its own techniques, but they share biomechanical foundations. We combine sport-science methodology with experienced coaching practice and AI-supported motion analysis.

Methodological focus

Performance factor analysis — the systematic breakdown of complex performance into nameable, measurable components: for example the racket angle at the point of contact, or the length of the breaks between points. Applied in individual and group training, in association and club work and in individual career planning.

Biomechanics as the key to success

Racket sports are not only sport, but also science. Through a deep understanding of body mechanics, athletes can optimise their technique, prevent injuries and raise their overall performance. The analysis of movement, force transfer and correct posture is decisive in maximising the efficiency of every stroke.

Tennis ball meeting the strings, macro still frame
The moment of contact — where biomechanics becomes visible.

What we offer

  • Mental Sports Coaching to GPTCA / ISMCA standard
  • Performance factor analysis for tennis, padel, pickleball and golf
  • Individual and group training
  • Association, university, club and high-performance sport support
  • Career planning
  • Digital diaries with AI feedback (Phöni)
  • Performance planning in the sporting context

Body and mind — connected by data

In professional sport, peak performance does not come from ever more training, but from precise control of the interplay of load, recovery and self-observation. Over 15 years of international coaching in tennis, padel and pickleball have shown me: the difference between good and great performance lies in making visible what happens between the strokes.

Phöni — the AI assistant of BallScience4U

Phöni supports the training process: motion analysis, load management, competition preparation, training diary. Phöni is a tool, not a replacement for human coaching. All training decisions are made together with your coach.

Phöni in the Performance Lab — example dialogue

Player
I hit everything in training — but in the match I lose focus.
Phöni
In the match you train something different than in practice. Let's look at your break architecture and your energy profile around your last matches.

Second documented example (Performance Lab): »Play is not technique, it's energy distribution. Learn to manage your breaks – not just your points.«

Andreas Ehstand hitting a ball, still frame
Movement is decision in real time
Whoever understands how he thinks understands how he plays.
Coach · Author · Sport Scientist

Andreas Ehstand

„Whoever understands how he thinks understands how he plays.“

supported by performance factor analysis in sport through artificial intelligence

Coaching experience

Over 15 years of international experience in high-performance coaching, in tennis, padel and pickleball. Bundesliga and ITF coach. Stations include the USA, Austria, Qatar and Dubai as well as, nationally, Bavaria, Hamburg, North Rhine-Westphalia, Schleswig-Holstein and Baden-Württemberg.

Academic background

Sport-scientific and empirical-methodological training at the University of Bayreuth and at TU Dortmund (Institute for School Development Research, research associate (2012–2013)). Teaching experience at universities in sport pedagogy, general pedagogy, didactics and performance factor analysis.

Qualifications

  • Toni Nadal Excellence Programme (Rafa Nadal Academy)
  • GPTCA / ISMCA Tennis Mental Coach (Alberto Castellani, GPTCA)
  • B-Trainer Leistungssport
  • Co-author of the book „Faszination Padel“ (Der Sportverlag, 2024), together with Christian Bonk

International references (sport)

Professional recognition from, among others, Toni Nadal, Tomáš Šmíd, Alberto Castellani (GPTCA), Hernan Flores (World Padel Tour, at the time of the quote) and Dominic Condrau (Olympia Paris 2024).

Andreas Ehstand hitting a ball, still frame
Golf
The same physics. A different flight.
Documented results

From LK2 to DTB 150 in six weeks.

LK2 DTB 150

Julia Wagner

Julia was able to improve very noticeably in the years 2013 to 2015 and in the years 2021 and 2022. She not only rose e.g. from the Bayernliga to the second Bundesliga, but her greatest rise in terms of performance development was demonstrably from LK2 to DTB 150 in just 6 weeks. As with a large part of the other noticeable player developments, the key point here, even before tactical elements, was the correct understanding of the force relationships at the point of contact. She was accompanied continuously in part from 2013 to 2015 and parts of her development were also documented in lectures at the Association of German Tennis Teachers. In the south German region, her player development attracted a great deal of attention due to the extremely rapid, measurable increase in ranking. (original in German)

Voices from the coaching

We were enthusiastic about the uncomplicated and clear style of communication. Also impressive was the sound sport-scientific knowledge that Andy was able to put into practical exercises. (original in German)
Dr. Gerrit Peitsch
We have rarely received so much from a coach in such a short time. Andy immediately recognises where the errors in the stroke are and knows the right solution for every problem. (original in German)
Bernhard Schlögl
Andy is a professionally qualified and competent coach. (original in German)
Helge Albrecht — Chairman Tennis Region Lüneburger Heide, organiser Senior ITF Mallorca
My son Ben had the opportunity to train with Andy in 2022, and we are really satisfied with the progress he made. In particular, the work on the contact-point fundamentals and the force relationships with the tennis ball at the point of contact helped him a lot. These techniques and the basic biomechanical understanding have noticeably improved Ben's game. The training in Andalusia and later in Hochkönig was a valuable experience, as were the further training sessions afterwards. He is now playing successfully in youth tournaments and in league matches in Baden-Württemberg. Andy worked with a lot of patience and commitment, which really motivated Ben to develop further. (original in German)
Caroline and Ben Görnik — association players BW
I am hugely looking forward to the publication of Faszination Padel on 14 October and am overwhelmed that so many pre-orders have already come in. As an author and journalist, my goal is to advance the sport of padel, and the book is an important step in that direction. I am particularly delighted that the training aspect in the book has been covered so thoroughly – an area that is crucial for the development of players. (original in German)
Christian Bonk — padel expert, journalist, co-author „Faszination Padel“
As a business consultant and padel coach with a background in psychology and business administration, I know how crucial scientific findings are for the development of athletes. The connection between mental strength and athletic performance is often the key to success. It is no different in padel – the right balance of mental preparation, physical training and tactical understanding can make the difference. I myself had the good fortune to train with Hernan Flores, who is featured in the new book Faszination Padel, and experienced first-hand how important sound knowledge is for progress in sport. (original in German)
Arndt Schmidtmeyer — business expert (business consultant & padel coach, background psychology/business administration)
Andreas Ehstand hitting a ball, still frame
Starnberg
Structured, biomechanically grounded coaching with AI support.
Booking & contact

Science meets Court.

Selected collaboration — the lab accepts few cases.

Your next step

Write me your age, your level and your preferred date — I will personally get back to you within about 3 working days. Direct online booking is currently paused; requests go by email or the form below.

Address

Nepomukweg 7
82319 Starnberg

Prefer WhatsApp
Contact & FAQ

Frequently asked questions

Questions and answers are available in both languages.

Which sports are offered?

Tennis, padel, pickleball and golf. Focus: performance factor analysis and mental sports coaching to the GPTCA / ISMCA standard.

Who is BallScience4U for?

— Clubs and associations looking for structured coaching for their competitive players — Individuals with a competition or association background — Universities and colleges with sport programmes — Experienced players who want to systematically develop their technique further Beginner coaching is possible on a case-by-case basis, but is not the focus.

What is Phöni?

Phöni is the AI assistant of BallScience4U. It supports the training process through motion analysis, load management, training diary and competition preparation. Phöni is a tool, not a replacement for human coaching.

More details: License of Clarity →

How does a coaching engagement work?

After an initial conversation (phone or video), an individually tailored training plan is developed. Coaching takes place as one-on-one training, group training, or as digital companion coaching with Phöni support. Exact terms (location, duration, pricing) are clarified in a personal conversation.

Is my data stored?

This website sets no cookies. Only localStorage and sessionStorage are used for language choice and the one-time loader animation per session (technically required under § 25 Abs. 2 TDDDG). No third-party embeds (videos or maps) are loaded. When booking individual AI-supported services you will be separately informed before any contract.

Details: Privacy policy →

Are health or psychotherapeutic services offered?

No. BallScience4U offers sport coaching and mental sports coaching in a sporting context. For health, psychotherapeutic or medical questions, please contact the appropriately qualified professionals.

Are financial, legal or career advisory services offered outside of sport?

No. BallScience4U is limited to sport performance coaching and sport-related career planning. Advice in other areas of life is outside the scope of the offer.

Where can Andreas Ehstand be reached?

Phone: +49 151 29108224 Email: andreas.ehstand@augmanitai.com Address: Nepomukweg 7, 82319 Starnberg

Which brands are protected?

License of Clarity®, BallScience4U and Phöni are designations with claimed trademark or trade-name protection.

Details: Protection & rights →

AUGMANITAI

BallScience4U is the performance lab of the AUGMANITAI research programme — where research on human-AI interaction meets the court.

Andreas Ehstand is an independent AI terminologist and founder of AUGMANITAI: he watches real moments between people and AI and distills them into clear, checked terms — currently more than 7,000 entries, checked against the scientific ISO 704 standard.

augmanitai.com →

Private research and testing site of the AUGMANITAI research programme. Nothing is sold online; enquiries are handled individually. No legal, financial or health advice. AI-assisted media are labeled as such.Private Forschungs- und Test-Seite des AUGMANITAI-Forschungsprogramms. Online wird nichts verkauft; Anfragen werden individuell behandelt. Keine Rechts-, Finanz- oder Gesundheitsberatung. KI-unterstützte Medien sind entsprechend gekennzeichnet. Imprint · Privacy · Disclaimer