SolFit has everything you need to develop a safe and effective home exercise program that can be modified to suit your fitness level as you grow. Let SolFit help you on your fitness journey and begin living healthier one step at a time.

Solfit (formerly DJL Medex) is a unique mobile personal training service specializing in customizable in-home fitness programs, medical/corrective exercise, yoga asana, classic personal training, home gym design and fitness program management in Honolulu, HI.

SOLFIT offers several types of exercise programming designed to give you the best results safely and effectively. SolFit can also provide you with everything you need to maintain and progress your independent fitness regimen for years to come. You bring your drive and commitment and let SOLFIT do the rest. Every fitness program starts with a thorough assessment and is tailored to your specific needs and goals.

David Langfelder owns and operates SolFit with his business partner and wife Gemady. Gemady Langfelder is student of nutrition at the University of Hawaii at Manoa. David is currently attending a Master's degree program in acupuncture and traditional Chinese medicine. They hope to graduate within the next few years and incorporate these skills as well as massage therapy into SolFit's treatment options for clients.

David's fitness journey began at the age of 18, when he started experiencing pain and morning stiffness which worsened over time. He was eventually diagnosed with ankylosing spondylitis which had a profound impact on his ability to work and his overall quality of life. After several years of progressively worsening symptoms and side effects from medications, he began incorporating fitness, nutrition as well as acupuncture and other TCM modalities into his life. David's life was changed for the better and he decided he would pursue a career that could enable him to help others struggling with medical conditions and poor lifestyle habits to start their own fitness journeys. 



The Medical Exercise Specialist

Medical Exercise Specialists (MES) are extensively trained in the condition-based anatomy and pathology of over 50 common medical conditions. Medical exercise specialists are also trained in protocol-based approaches on the progressive management of these conditions. These protocols have been designed by medical professionals. Because of this, the MES can accurately understand how to create safe and effective exercise programming that will produce results for the client. Any professional who works with clients who have medical conditions must be able to understand medical terminology and communicate effectively with medical professionals. Medical Exercise Specialists are extensively trained in medical communication and terminology. Medical Exercise Specialists not only know the contraindicated movements and exercises associated with common pathologies, but also understand the underlying functional anatomy, kinesiology, physiology and biomechanics that informs the MES why these movements and exercises are unsafe and allow the MES to design specialized fitness regimens that are unmatched in quality, safety and effectiveness. Because of their specialized training, Medical Exercise Specialists can quickly identify red flags and warning signs during training sessions in order to avoid injury. Medical Exercise specialists can also get results while preventing injury in apparently healthy populations by using proven safe and effective fitness programming.

Medical Exercise Specialists are Capable of Training Clients with Various Conditions: 

AC Joint Separation
ACL Rupture
Achilles Tendon Rupture
Ankle Fracture
Ankle Sprain

Bicipital Tendinitis

Carpal Tunnel Syndrome
Cerebrovascular Accident
Cervical Disc Herniation
Central Stenosis
Cervical Strain



Glenoid Labrum Tear
Golfer’s Elbow


Impingement Syndrome
IT Band Syndrome

Knee Meniscus Tear

Lateral Stenosis
Lumbar Disc Herniation

Meniscus Tear
Multiple Sclerosis


Patello-Femoral Syndrome
Patella Tendon Rupture
Parkinson’s Disease
PCL Rupture
Piriformis Syndrome

Rotator Cuff Tear
Rheumatoid Arthritis

Shoulder Dislocation
Spinal Fusion
Spinal Stenosis

Tennis Elbow
Tibial Plateau Fracture
Total Hip Replacement
Total Knee Replacement
Thoracic Outlet Syndrome
Total Shoulder Replacement

Is your condition not listed above? Click here to contact SolFit to find out if you are a good candidate for a medical exercise program. Please include all medical condition(s), any medical treatments you've received, past surgeries and/or prosthetic devices you have and we will get back to you as soon as possible.