Doctors of Running (formerly Kleinruns DPT) began as a way for me (Dr. Klein) to share my thoughts and learn more about my major interests: footwear, biomechanics, physical therapy, 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,  Chief Editor and Founder of Doctors of Running
Casa Colina Orthopedic Resident

Dr. 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 1:11:11 half marathoner and 14:45 5k runner who runs 70-100 miles per week.  Matt 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 began his orthopedic residency at Casa Colina in 2017 and will continue on to a manual therapy and sport fellowship at Kaiser Southern California in 2018.  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 will continue to write about his experience as a Doctor of Physical Therapy, runner and footwear geek.  This will include a great deal of shoe reviews, training/racing updates, things he learns in clinic, exercises he is experimenting with, research and more.

He is currently a Salming and Skratch Labs Ambassador and looks forward to returning to highly competitive running in 2018.

As an extra, he is a talented fiddle player and composer with several tunes published in the Portland Collection volume 3.

Road and Track Race PRs
3K: 8:53 (2013)
5K: 14:45 (2013)
8K: 24:51 (2012)
10K: 31:36 (2012)
Half Marathon: 1:11:11 (2014)

Nathaniel S Kollias, DVM, MPH, Co-Reviewer and Contributor
Cornell University Laboratory Animal Resident

Dr. Kollias joined Kleinruns DPT in 2016.  He has extensive history with footwear as a competitive road and trail racer.  Nathaniel S Kollias is a Doctor of Veterinary Medicine and is currently in residency at Cornell University receiving training in Laboratory Animal Veterinary Medicine.  He has never run for a team and simply started running at the end of high school as a means to maintain his sanity.  He has become more competitive with his training over the last couple of years.  Besides his obvious passion for running, he is a shoe geek and loves researching the science on up and coming shoe technology and the newest scientific literature on running.  When he isn't running around, performing surgeries, or attending to other medical cases, you can find him hiking with his border collie Sugar or enjoying beer at the local brewery.

Road Race PRs
5K: 16:47 (2016)
10K: 35:31 (2016)
15K: 1:08:16 (2010)
1/2 Marathon: 1:16:23 (2017)
Marathon: 3:20:02 (2010)

Trail Races:
10K: 46:10 (2016)
12K: 45:06 (2015)
1/2 Marathon: 1:49:40 (2016)

Christian Park (Future Doctorate), Guest Reviewer and Contributor

Christian is a varsity scholar athlete at Orange Lutheran High School (Class of 2019) with a keen interest in the world of running footwear.  As a competitive long distance high school athlete he is fascinated by the regenerative abilities of the human body and the biomechanics of human movement.  He began running in 2016 and loves reading into new running technologies and products.  Although he struggled with nasty falls that ended both track seasons and affected most of his junior season of XC, he hopes to hit some huge PRs this upcoming track season.  Other hobbies outside of running include doing research at his intership for micro and nano bioemchanics.

Road and XC PRs:
5k: 16:26 (2016) (listed as 3 mile course but actually 5k)
10 mile: 59:13 (2016)
Half Marathon: 1:25:28 (2016)

Thank you for reading and feel free to reach out to any or one of us!


  1. I am a 3 hour marathoner, who hasn't run in1 year due to neuroma surgery...my neuroma isn't truly fixed, my knee/it band is in pain--help me! And what is the right shoe for me??? #lasthope

    1. Hey BD. I have been trying to figure out how to address your question for a week.

      Since I have not been able to physically in person evaluate your running/walking form, complete injury history and more, I cannot truly treat you. Based on the little info you have given me, I would make sure you have a shoe with wide toebox that does not put ANY pressure on that neuroma. If you continue wearing tight shoes your neuroma will only get worse. I have had several patients who didn't change their footwear and movement patterns after having surgery and ended up having a neuroma return in a similar spot. A neuroma is a thickening of the nerve tissue in the nerves between the metatarsal bones usually in response to excess pressure. Narrow toe boxes put excessive pressure on those nerves by smashing the toes together. Additionally, based on your knee/IT band pain, I'm going to guess you have extremely weak hips. Whether that is coming from pain in your foot altering your movement pattern and you trying to load heavily at your knees instead of your foot due to pain, or if you have always had an underlying hip weakness, you need to strengthen you hip musculature. Most IT band/knee pain relates to poor loading at the knee joint from weakness elsewhere.. commonly from the hip musculature. That would also make sense if your hips are weak that you would have a neuroma because you are getting your propulsion from running excessively from your foot via excessive calf use, which can put heavy pressure on those metatarsals and your forefoot. Optimally your hips should contribute a great deal to forward propulsion in running equally along with the rest of the muscles and joints of your legs (quads, calves, hamstrings, glutes should contribute. When you over utilize one because others are weak, that's when injuries can happen), but sounds like yours are weak and you've been running for years with weaknesses, poor form and now your body can't compensate any more.

      I would go see a physical therapist or medical professional who specializes in running. Do not see someone who does not have experience with runners or is not a runner themselves. A physical therapist is going to be your best bet for truly changing your poor movement patterns that may have been creating these issues. Physical therapists are in charge of the movement system more than any other profession.

      So again those are my thoughts above. I am not treating you and you need to seek medical help. I have not physically examined you so do not rely on my words as medical advice. Those are just my thoughts based on what I have seen. I do not know if you may have something else going on because I do not have your full history. Please see someone and do not try to sort this out yourself. There is a reason medical professionals spend so much time learning before our professors let us out into the real world.

      Hope my advice provides some helpful insight.

      Thanks for reading a good luck.