#ownyourmentalgame We train coaches on how to get the most out of themselves and their players by creatively addressing mental aspects of the game.
At Courtex Performance LLC, we help players and teams develop mental toughness by teaching them how to elevate their confidence, manage their emotions, increase their focus, develop their communication and leadership skills, and enhance team chemistry. Additionally, we help coaches and basketball professionals (e.g., front office personnel) develop their philosophies and prepare for job opportunit
ies by creating professional portfolios and other resources and engaging in mock interviews. We also assist basketball organizations that are looking to change or strengthen their internal culture through communication training, creative player and employee assessment, and more. Our approach is based on a collaborative relationship with our clients as we value our clients’ input and strive to build trust throughout the consulting process. MENTAL TRAINING EXPERIENCE AND INFLUENCES
While Courtex Performance LLC was founded in 2013, Owner and Lead Mental Coach Dr. Rainer J. Meisterjahn has provided mental training for clients at all levels, including the NBA, FIBA, and NCAA D-I, II, and III since 2007. Rainer has had the unique opportunity to work with accomplished NBA players like Tobias Harris (Orlando Magic) and coaches like Adrian Griffin (Chicago Bulls) as well as numerous others at all levels of basketball who are motivated to elevate their mental game. Additionally, in 2013 Rainer served as a consultant to the Milwaukee Bucks organization, developing interview guides, conducting numerous NBA Pre-Draft interviews, administering and interpreting mental assessments, and breaking down his observations for the front office. Courtex Performance LLC’s approach is anchored in a firm belief in continuous learning. Over the years, Rainer has broadened his knowledge about the mental game of basketball in personal interactions with NBA players (e.g., former All-Stars Jermaine O’Neal and Dale Ellis), NBA coaches (e.g., Adrian Griffin, Chicago Bulls), NBA front office personnel and staff (e.g., John Hammond, Milwaukee Bucks GM; Jeff Weltman, Toronto Raptors Assistant GM; Dr. Keith Henschen, Utah Jazz Sport Psychology Consultant; Dr. Jack Lesyk, Cleveland Cavaliers Sport Psychology Consultant), NCAA coaches (e.g., Cuonzo Martin, University of California Men’s Basketball; Tyler Summitt, Louisiana Tech Women’s Basketball), and international players (e.g., Tremmell Darden, Real Madrid Baloncesto) and coaches (e.g., Mike Koch, Medi Bayreuth; Chris Ensminger, Oettinger Rockets Gotha). ACADEMIC CREDENTIALS AND BASKETBALL BACKGROUND
Rainer is a Certified Consultant with the Association for Applied Sport Psychology (CC-AASP). In addition to seeking out countless applied learning opportunities he has enjoyed a prestigious formal education, earning three university degrees:
Ph.D. in Kinesiology with a Specialization in Sport Psychology and Motor Behavior, University of Tennessee (UT), 2011
M.S. in Counseling Psychology, Frostburg State University (FSU), 2008
B.A. in Behavioral Sciences with a Concentration in Psychology and a Minor in Coaching, University of Maine at Machias (UMM), 2004
In combination with his applied consulting work, Rainer has presented at numerous international conferences and spoken about the mental game of basketball to players and coaches at Joe Abunassar’s Impact Basketball Academy in Las Vegas and at Mike Lee Basketball in Milwaukee. Rainer has also designed and implemented on-court skills workouts for players such as Tobias Harris (Orlando Magic) and Chris Lofton (former All-American, University of Tennessee) and assisted with numerous other NBA player workouts (e.g., John Wall, J.J. Hickson, Jared Dudley) while also coaching several youth teams in Germany. As an undergraduate student, Rainer played for the UMM Clippers basketball team in Machias, ME. He also competed for SOBA Dragons Rhöndorf in the Regionalliga 2 and founded the T.V. 1890 Schmallenberg e.V. basketball department in Germany.
08/13/2026
Now Hiring! Mental Performance Coach (PD-ID # 081226-A)
The Courtex team is growing and excited to announce we have a new opening for a mental performance coach to join our team in a full-time capacity to support select global clientele (particularly in basketball). This is a remote position with domestic / international travel.
Please review role details, responsibilities, and qualifications within Courtex PD-ID # 081226-A and apply online at courtexperformance.com.
Applications will be reviewed on a rolling basis. Due to the volume of interest and inquiries, we ask that candidates kindly do not call, text, or email about the open position beyond what is asked for within the application form.
Thank you!
08/11/2026
🧠🏆 As the 2026–27 basketball season prepares to tip off, we’re taking a moment to celebrate some of the successes our clients achieved throughout the 2025–26 season.
From team accomplishments to individual accolades, their dedication, commitment, and growth were on display all year long. At Courtex Performance, we’re proud and honored to support every client who chooses to take ownership of their mental game.
We look forward to another season of growth, resilience, and success.
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08/06/2026
Congratulations to more of our guys on officially taking the next step in their careers.
Each journey is unique, but all are connected by a commitment to growth and taking ownership of the mental game. We’re excited to continue the work this coming season!
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07/27/2026
Here are some more insights from our time at the NBA Summer League. It was great to reconnect with friends, colleagues, and partners from across NBA, EuroLeague, and FIBA Basketball coaching, agency, and mental/sports performance spaces.
Looking forward to carrying these conversations and insights into the future.
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07/22/2026
A quick look back at an incredible week at the NBA Summer League. It was great to see several of our players competing while also having the chance to spend time face-to-face, strengthen relationships, and exchange ideas with them.
Looking forward to carrying these conversations and insights into their seasons ahead.
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07/08/2026
Heading to Las Vegas for NBA Summer League.
Courtex Performance will be in the building July 9–15th, connecting with people across the basketball world: team personnel, agents, scouts, trainers, coaches, athletes, and everyone committed to taking ownership of their mental game and leveling up their leadership.
Comment or DM us if you’ll be there. We’d love to connect and network.
07/07/2026
🧠 Successful week for Canada Basketball , as the guys secured two crucial wins toward FIBA Basketball World Cup qualification. Way to commit and get the job done collectively!
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07/07/2026
Congrats to our guy on officially joining Unicaja Baloncesto. After finishing this season as a top-4 scorer in the Liga Endesa, Cam looks to continue his journey in new colors. He keeps trusting his craft, bettingon himself, and taking ownership of his mental game. Looking forward to this upcoming season and continuing to work together!
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07/02/2026
Congrats to our guy Jason Burnell 🏀🏀1⃣4⃣ on officially joining Olimpia Milano. Over the past 3 seasons, Jason has been one of our most committed athletes and consistently values taking ownership of his mental game. His growth and development across the board have been nothing short of impressive, and he is now ready to take on the EuroLeague. Looking forward to our continued work and being a part of his ongoing journey.
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