Clinical Analysis of Running, Running Footwear, and Injury Prevention/Performance. The Doctor(s) of Running, using knowledge of human movement, clinical biomechanics and performance to bring you cutting edge reviews, science and knowledge.

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Doctors of Running (formerly Kleinruns DPT) began as a way for me (Matt Klein) to share my thoughts and learn more about my major interests: footwear, biomechanics, physical therapy, rehabilitation, running and performance.  It continues to evolve to this day to meet the needs of those who contribute, those who read/visit and those looking for assistance.



Matthew Klein, PT DPT OCS FAAOMPT - Chief Editor and Founder of Doctors of Running
PhD Candidate Azusa Pacific University 

Dr. Matthew Klein began this blog as a Doctor of Physical Therapy student attempting to make sense of the world and share it with others.  He is a residency and fellowship trained clinician specializing in orthopedic and sports rehabilitation.  He is further specialized in running sports and treating runners of all ages and abilities.  Dr. Klein has been running for almost 10 years, was an accomplished DIII runner including being the 2012 NWC 10,000m Champion and continues to compete at a moderate to high level.  He graduated from Western University of Health Sciences in 2016 with his doctorate, passed boards the same year  He completed his orthopedic residency at Casa Colina in 2018 and completed a Manual Therapy and Sport Fellowship at Kaiser Los Angeles Medical Center in Southern California in 2019.  He achieved Fellow status in the American Academy of Orthopedic Manual Physical Therapists in April of 2019.  He has extensive history in the footwear world, working in the running industry for years prior to becoming a Doctor of Physical Therapy.  He has participated in and written research on footwear and running and continues to discuss and learn about those and more.  He currently consults for several footwear companies helping with the development of shoes with appropriate biomechanics in mind.  


He is currently engaged to elite marathoner Regina Lopez, who is preparing for the 2020 Olympic Trials Marathon.  They can be found training together throughout Southern California. 




Current PR's 

3K: 8:53 (2013)
5K: 14:45 (2013)
8K: 24:51 (2012)
10K: 31:36 (2012)
Half Marathon: 1:11:09 (2019)
Marathon: 2:32:43 (2019)

Nathan Brown PT DPT MS - Chief Contributor 
Point Forward Physical Therapy


Nathan Brown is a Doctor of Physical Therapy who practices in Stevens Point, WI at Point Forward Physical Therapy. He specializes in orthopedic and sport rehabilitation with a special interest in runners and running injuries. He obtained his undergraduate degree in kinesiology from the University of Wisconsin - Madison. He then obtained his masters in anatomy and clinical health sciences and doctorate in physical therapy from the University of Delaware. In addition to these degrees, he has advanced training and certification from the Movement Performance Institute in Los Angeles specializing in biomechanics (which is where he and Dr. Klein met).



Dr. Brown's interest in running did not spark until he entered college when he began running casually to remain healthy. Running quickly became his favorite way to be active and connect with others. He is now a locally competitive runner whose favorite distances are half marathon and marathon.

He now is regularly competing in everything from a 5K to Marathons as well as recently delving into trail running. Depending on his training cycle he is running anywhere from 15-45 miles/week. Dr. Brown may not be an elite runner, but is excited to represent the competitive recreational running community while applying advanced knowledge in running mechanics, biomechanics, and shoe technology.



Nathan is married to his wife Jana and they have two sons, Henry and Raymond. Being from Wisconsin, their family loves to play outside, eat good cheese, and cheer on all our local sports teams (let's go Badgers, Packers, Bucks, and Brewers!). Stroller runs are becoming a new norm as well.

Current PR's
5K: 19:22 (2019); Tempo Run
10K: 39:30 (2019); Rosholt Labor Day Run
Half Marathon: 1:33:34 (2019); Interval Tempo Run
Marathon: 3:54:17 (2017); Chicago Marathon


David Salas, PT DPT CSCS - Chief Contributor
Elite Physical Therapy/ All Star Physical Therapy



David is a Doctor of Physical Therapy in Southern California from Western University of Health Sciences.  He became a Certified Strength and Conditioning Specialist in March of 2019 and is currently a Cupping Certified Practitioner.  He began running in high school and furthered his running career at the NCAA Division I level for Saint Mary's College. David is racing again now that he has finished the doctorate program.

He enjoys trail running and is working toward ascending mountains across California. He has run up Mt. San Antonio (A.K.A. Baldy in SoCal), Chalone Peak (Pinnacles National Park), and will soon ascend Mt. San Gorgonio. David will also begin competing again in the USATF Cross Country series this fall as a means to train up to the longer road races.

David is based out of the Inland Empire (Redlands, CA) and is more than happy to do evaluations for runners in Southern California. Please contact him through DOR's email for details on pricing and options.

Current PR's:
1500m: 3:54 (2016)
5000m: 14:56 (2012)
8000m XC: 25:00.1 (2012)

Half Marathon: 1:16 (2017)


Thank you for reading and feel free to reach out!

Feel free to contact us at doctorsofrunning@gmail.com

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