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  For over 20 years Raj Chaudhuri has traveled the world as a professional Tennis Coach and Strength and Conditioning Coach.  His experience of working on the WTA Tour as well as Fed Cup, and Olympic teams provided tremendous insight into the needs of an elite athlete.  The competition in the world of professional sport demands a constant search to find more effective methods to elevate performance. There is a delicate balance required to train an athlete to their potential without endangering their safety and livelihood.  The concept behind the Synapse® aimed to remove the limitations of current training methods and enable an athlete to train at maximum capacity without fear of injury.

     After combining real world experience, cutting edge scientific research,  and numerous trials on multiple prototypes, the Synapse® was born.  Its simple, elegant design automatically tailors the resistance to each individual, making it possible to fully and safely load all phases of movement (concentric, isometric, eccentric).  This unique feature can more efficiently improve strength and fitness, help prevent injury, and makes strength training accessible to any population.  It is our aspiration that professional athletes, fitness enthusiasts, mature populations and physical therapy patients can all employ the Synapse® to achieve their performance, strength and fitness goals.  Everyone can maximize their potential with the Synapse®


Raj Chaudhuri

Inventor of the Synapse

Professional Tennis Coach / Strength and Conditioning Coach with over 2 decades of experience working with numerous Grand Slam and WTA Tour Champions as well as US Fed Cup, and Olympic Teams

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in the Media

The Synapse had been featured in a number of publications, podcasts, and more...

Links below:

Superhuman Performance Podcast with Nathalie Niddam:  Audio Podcast


Nathalie Niddam is an expert in the field of health and longevity.  Her unique method blends an array of human performance fields like neuroscience, personalized nutrition, nutraceuticals, biohacking, ancestral health and resilience training.

M2 Podcast with Guy Massi: 

Guy Massi is the owner of M2 Performance and works with professional athletes/teams creating protocols for elite performance and return to play. He is a sought after consultant, speaker, and educator.


Young Body Challenge with Joel Greene: 


Joel Greene is the author of the Immunity Code - a groundbreaking new approach to health, well being and longevity. We discuss how the principles behind the Synapse work to make strength training accessible with the inevitable time constraints that real life presents. Short, intense stimuli fit the model of the Immunity Code for large impacts long term on health and longevity

Muscle and Fitness Magazine :

"4 Unique Workout Pieces To Up Your Workout Game"

Outside Magazine:

"The Best Home Gear of 2022"

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The Synapse collaborators are experts in the field that have built success through research, exploration and vast experience in their discipline.  They have embraced the unique features of the Synapse and overlay the deep knowledge of their craft.  Each of them have created exclusive Synapse protocols and movements to maximize the performance of their athletes and clients. Click the logo links below to learn more.

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Go to resource for all things baseball and softball. They have created ground-breaking Synapse protocols to elevate the performance and health of their MLB, collegiate, amateur, and junior athletes

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Physiotherapy and Sports Performance specialists based in Germany.  They apply the Synapse to improve strength, mobility, and movement in the inernational athletes they work with across multiple professional sports.

  1. Berg, Ole & Kwon, Oh Sung & Hureau, Thomas & Clifton, Heather & Thurston, Taylor & Fur, Yann & Jeong, Eun-Kee & Amann, Markus & Richardson, Russel & Trinity, Joel & Wang, Eivind & Layec, Gwenael. (2018). Maximal strength training increases muscle force generating capacity and the anaerobic ATP synthesis flux without altering the cost of contraction in elderly. Experimental Gerontology. 111. 10.1016/j.exger.2018.07.013.

  2. Bond, V,Jr, Wang, P, Adams, RG, Johnson, AT, Vaccaro, P, Tearney, RJ, Millis, RM, Franks, BD, and Bassett, DR,Jr. Lower leg high-intensity resistance training and peripheral hemodynamic adaptations. Can. J. Appl. Physiol. 21: 209-217, 1996.

  3. Cermak NM, Snijders T, McKay BR, Parise G, Verdijk LB, Tarnopolsky MA, et al. Eccentric exercise increases satellite cell content in type II muscle fibers. Med Sci Sports Exerc (2013) 45(2):230–7.10.1249/MSS.0b013e318272cf47

  4. Chen C.L., Chang K.J., Wu P.Y., Chi C.H., Chang S.T., Cheng Y.Y. Comparison of the Effects between Isokinetic and Isotonic Strength Training in Subacute Stroke Patients. J. Stroke Cerebrovasc. Dis. 2015;24:1317–1323. doi: 10.1016/j.jstrokecerebrovasdis.2015.02.002. [PubMed]

  5. Chen TC, Tseng WC, Huang GL, Chen HL, Tseng KW, Nosaka K. Superior Effects of Eccentric to Concentric Knee Extensor Resistance Training on Physical Fitness, Insulin Sensitivity and Lipid Profiles of Elderly Men. Front Physiol. 2017;8:209. Published 2017 Apr 10. doi:10.3389/fphys.2017.00209

  6. Fimland M. S., Helgerud J., Gruber M., Leivseth G., Hoff J. Enhanced neural drive after maximal strength training in multiple sclerosis patients. European Journal of Applied Physiology. 2010;110(2):435–443. doi: 10.1007/s00421-010-1519-2. [PubMed

  7. Hedayatpour N, Falla D. Physiological and Neural Adaptations to Eccentric Exercise: Mechanisms and Considerations for Training. Biomed Res Int. 2015;2015:193741. doi:10.1155/2015/193741

  8. Helland, Christian & Hole, Eirik & Iversen, Erik & Olsson, M. Charlotte & Seynnes, Olivier & Solberg, Paul & Paulsen, Gøran. (2016). Training Strategies to Improve Muscle Power: Is Olympic-style Weightlifting Relevant?. Medicine and science in sports and exercise. 49. 10.1249/MSS.0000000000001145. 

  9. Hoppeler H. Moderate Load Eccentric Exercise; A Distinct Novel Training Modality. Front Physiol. 2016;7:483. Published 2016 Nov 16. doi:10.3389/fphys.2016.00483

  10. Horwath O., Paulsen G., Esping T., Seynnes O., Olsson M.C. Isokinetic resistance training combined with eccentric overload improves athletic performance and induces muscle hypertrophy in young ice hockey players. J. Sci. Med. Sport. 2019;22:821–826. doi: 10.1016/j.jsams.2018.12.017. [PubMed]

  11.  Jenkins NDM, Miramonti AA, Hill EC, et al. Greater Neural Adaptations following High- vs. Low-Load Resistance Training. Front Physiol. 2017;8:331. Published 2017 May 29. doi:10.3389/fphys.2017.00331

  12. Julian V, Thivel D, Costes F, et al. Eccentric Training Improves Body Composition by Inducing Mechanical and Metabolic Adaptations: A Promising Approach for Overweight and Obese Individuals. Front Physiol. 2018;9:1013. Published 2018 Aug 7. doi:10.3389/fphys.2018.01013

  13. Kidgell DJ, Frazer AK, Daly RM, et al. Increased cross-education of muscle strength and reduced corticospinal inhibition following eccentric strength training. Neurosci. 2015;300: 566–75.

  14. Komsis, Stergios. (2014). The Effects of Eccentric Training on Electromyographic Activity and Performance in Soccer Players. American Journal of Sports Science. 2. 23. 10.11648/j.ajss.20140202.13. 

  15. Lepley LK, Lepley AS, Onate JA, Grooms DR. Eccentric Exercise to Enhance Neuromuscular Control. Sports Health. 2017;9(4):333-340.

  16. Maeo S., Shan X., Otsuka S., Kanehisa H., Kawakami Y. (2018). Neuromuscular adaptations to work-matched maximal eccentric versus concentric training. Med. Sci. Sports Exerc. 50, 1629–1640. 10.1249/MSS.0000000000001611 

  17. Manca, Andrea & Dragone, Daniele & Dvir, Zeevi & Deriu, Franca. (2017). Cross-education of muscular strength following unilateral resistance training: a meta-analysis. European Journal of Applied Physiology. 117. 10.1007/s00421-017-3720-z.

  18. Marzilger R, Bohm S, Mersmann F, Arampatzis A. Effects of Lengthening Velocity During Eccentric Training on Vastus Lateralis Muscle Hypertrophy. Front Physiol. 2019;10:957. Published 2019 Jul 31. doi:10.3389/fphys.2019.00957Marzilger R, Bohm S, Mersmann F, Arampatzis A. Effects of Lengthening Velocity During Eccentric Training on Vastus Lateralis Muscle Hypertrophy. Front Physiol. 2019;10:957. Published 2019 Jul 31. doi:10.3389/fphys.2019.00957

  19. Moisés de Hoyo, Borja Sañudo, Luis Carrasco, Jesús Mateo-Cortes, Sergio Domínguez-Cobo, Orlando Fernandes, Juan J. Del Ojo & Oliver Gonzalo-Skok (2016) Effects of 10-week eccentric overload training on kinetic parameters during change of direction in football players, Journal of Sports Sciences, 34:14, 1380-1387

  20. Papadopoulos, Christos & Theodosiou, Konstantinos & Bogdanis, Gregory & Gkantiraga, Evangelia & Gissis, Ioannis & Sotiropoulos, Aristomenis. (2014). Multiarticular Isokinetic High-Load Eccentric Training Induces Large Increases in Eccentric and Concentric Strength and Jumping Performance. The Journal of Strength and Conditioning Research. 28. 2680-88. 10.1519/JSC.0000000000000456.

  21. Parker, James & Lagerhem, Charlie & Hellström, John & Olsson, M. Charlotte. (2017). Effects of nine weeks isokinetic training on power, golf kinematics, and driver performance in pre-elite golfers. BMC Sports Science, Medicine and Rehabilitation. 9. 10.1186/s13102-017-0086-9.

  22. Peterson, Magnus, Stephen Butler, Margaretha Eriksson, and Kurt Svärdsudd. 2014. “A Randomized Controlled Trial of Eccentric vs. Concentric Graded Exercise in Chronic Tennis Elbow (lateral Elbow Tendinopathy).” Clinical Rehabilitation 28 (9): 862–72.

  23. Ratamess, Nicholas & Beller, Noah & Gonzalez, Adam & Spatz, Gregory & Hoffman, Jay & Ross, Ryan & Faigenbaum, Avery & Kang, Jie. (2016). The Effects of Multiple-Joint Isokinetic Resistance Training on Maximal Isoki- netic and Dynamic Muscle Strength and Local Muscular Endurance. Journal of sports science & medicine. 15. 34-40.

  24. Richard L. Lieber, Biomechanical response of skeletal muscle to eccentric contractions,Journal of Sport and Health Science,Volume 7, Issue 3,2018,Pages 294-309

  25. Shaw, Brandon & Shaw, Ina & Brown, Gregory. (2015). Resistance exercise is medicine: Strength training in health promotion and rehabilitation. International Journal of Therapy and Rehabilitation. 22. 385-389. 10.12968/ijtr.2015.22.8.385.

  26. Wang E, Nyberg SK, Hoff J, Zhao J, Leivseth G, Tørhaug T, Husby OS, Helgerud J, Richardson RS. Impact of maximal strength training on work efficiency and muscle fiber type in the elderly: Implications for physical function and fall prevention. Exp Gerontol 91: 64–71, 2017. doi:10.1016/j.exger.2017.02.071. [PubMed]

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