136 Glass Street #140

Dallas, Texas 75207

Tel: (469)626-7254

Fax: (214) 237-1283


Opening Hours:

Mon Wed Fri: 6am - 4pm Tues Thurs: 11am - 7pm

​​Saturday: 10am-2pm ​

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© 2018 by Human Function and Performance, PLLC.


Alissa W.

"I appreciated the time Dr. John took to listen to all of my issues and questions in order to tailor exercises to target my needs. I feel great and can’t wait to get back into running pain free!"

Junji S.

So happy I found Dr. Earls! Instead of constantly treating my back pain at a chiropractor, he found the cause of why my body was moving incorrectly and causing the pain. He came up with a weekly plan to correct my movements and my back feels great now. It was hard work but the best investment I've made in myself. Highly recommend.

Ben A.

"John is a very professional, extremely knowledgeable Physical Therapist. He is a fine young man who has a passion for using his expertise to make a difference in people's lives. John developed and guided me through a therapy program that significantly increased my mobility and balance. He has been a pleasure to work with, I recommend him highly."

Chris G.

I had a pretty severe bulged disc in my lower back, and I was looking for alternatives to surgery. After finding John online and going in for a consult, I decided to move forward with a treatment plan. John truly understands how the body works, and he encouraged me to continue doing CrossFit, but more importantly, he showed me how to do it safely. We focused on a combination of form, mobility, and strength in order to take pressure off my lower back. Thanks to John, I’m back in the gym and my lower back is feeling great!

Leah A.

I’ve struggled with various running related injuries for several years and went through a number of physical therapy cycles. Most of the PTs seemed to target the injury/painful area and never looked at the body comprehensively, which is why I think my injuries continued. After 4 sessions with Dr. Earls I was able to start running again. I can honestly say that he has been by far the most knowledgeable PT I’ve seen, and he does assess the total body. He spends the entire session with you one on one which I can almost guarantee you won’t find in any other clinic settings. After 10 sessions with him I’m 100% and feel confident that even if I do have minor flare ups in the future that he has given me the knowledge to be able to address them before they become an issue. Would definitely recommend!

Tori V.

"John's methods of teaching postural restoration are effective and fun. He teaches in such a way that each exercise is clear, goals are attainable and the results speak for themselves. He roots for you every step of the way. I am now able to live my life pain free and enjoy all the activities I love. Thank you John for giving me the ability and skills to be strong and live life to the fullest!"

Ruth S.

"As a client of Dr. John Earls, I have experienced his professionalism, good humor, empathy and intelligence.  His knowledgeable recommendations are helping me pursue my goals toward postural restoration."