01442 800400 Monday - Friday 8:30 - 18:00 Saturday 9:00 - 13:00 42 Lower Kings Road, Berkhamsted Herts HP4 2AA
Simon King

Simon King

Over 30 years Simon King has developed a deep and unique understanding of the importance of muscle reflexes and muscle strength in the maintenance of a healthy and pain-free body. He uses innovative treatment strategies to help patients become stronger and healthier so they can exercise and live without fear of illness or injury.

Did You Know?

Nerve messages that go TO the brain are called AFFERENT (towards), while those that come FROM the brain are called EFFERENT (away from).

Simon King is an expert in Afferent Input and using Afferent Input to treat and prevent musckuloskeletal injuries.

Over thirty years in practice, Simon has always strived to understand the true origins of disease and ill health. Fascinated by muscle testing and the connections between nerves and muscles, he set about learning all he could about Applied Kinesiology and eventually became a diplomate of the ICAK in 1996. He has gone on to teach hundreds of practitioners the principles of Proprioceptive Medicine and Afferent Input.

With Jane Eastoe, he started the Naturality Wellness Centre in 2005 and has returned to the clinic after 6 years in Australia.

Simon is available Mondays, Wednesdays, Thursdays and Saturdays. His specialties include sports injuries, sports performance enhancement, chronic pain and disability.


Restoring Robustness; Recreating Health

Afferent Input

Afferent Input is the diagnosis and treatment of abnormal muscle tone.

Muscle tone is fundamental to human function.

Muscles are highly complex organs that do far more than just move us.

Muscles are sensory organs. Special cells within muscles constantly send messages to the nervous system so that we instinctively know the amount of tension each muscle is under and how long it is. That is how we know where our body is without looking. Muscles are the origin of most of the messages running the nervous system.

Every muscle has resting muscle tone – it is contracting even when not active.

Resting muscle tone exists in everyone, whether or not they go to the gym. It cannot be altered by exercise, stretching or massage.

Muscle tone protects our body from injury and is the basis of all movement.

That’s why it’s vital to assess muscle tone and make sure it’s optimal, not too much, not too little.

Low muscle tone will predispose to injury as the protective reflexes fail. Joints are damaged and over the long-term form osteoarthritis. Muscle tone also affects the glands and organs – leading to tiredness, fatigue and susceptibility to infections.

High muscle tone can cause aching and cramping. While high muscle tone is good in the short-term, it is not sustainable in the long-term.

As we get older, we may ignore the natural laws that would protect us from messing up our muscle tone and we suffer the consequences.

An Afferent Input consultation starts with FULL ASSESSMENT of muscle tone, including neurological and orthopedic testing. If areas of low muscle tone (inhibition) or increased tone (tightness or spasm) are found, the practitioner changes sensory input until tone is normal and then uses whatever treatment is necessary to make those changes permanent.

gluteal muscle testing
Testing the gluteal, hamstring and low back muscles which are very important for running, walking, sitting and standing.

Imagine jumping off a chair onto the ground.

At the moment of impact, certain muscles start to stretch, activating hugely increased firing of the sensors in those muscles. Messages are sent to the spinal cord and immediately return to the muscle, increasing its tone, power and strength ensuring that you do NOT fall on the floor, sprain your ankle or dislocate your knee.

Imagine now you do that same jump but this time you land in bare feet on broken glass. A different reflex (the withdrawal reflex) would prevent your quadriceps from contracting because the withdrawal reflex produces INHIBITION of the quadriceps and FACILITATION of the hamstrings. The withdrawal reflex, which would normally prevent injury by stopping you from pushing your foot through a nail, now CAUSES injury by removing strength from the muscles you need.

It turns out many persistent illnesses and injuries are caused by muscle inhibition.

An Afferent Input practitioner tests the output of the muscles. Where that output is deficient or inhibited, the practitioner can provide a solution, one that restores normal muscle tone. 

Depending on the patient, treatment may involve:

  • Removing foreign bodies,
  • Stimulating joints and muscles (manipulation and adjustment),
  • Identifying and correcting nutritional deficiencies,
  • Identifying and correcting food intolerances,
  • Identifying and correcting environmental toxins.    
neck muscle testing
Checking the strength of the posterior neck muscles. If weak the neck could be prone to pain and injury.
Make an Appointment

Simon is available at the Naturality Wellness Centre in Berkhamsted on Mondays, Wednesdays, Thursdays and Saturdays.

Treatment is centred around muscle testing to formulate a diagnosis and a plan for treatment which may involve the removal of foreign bodies (especially metal), gentle manipulation, exercise, nutrition, or environmental change.

Special interest is in sports injuries, sports performance, chronic pain and disability.

Make An Appointment

Tel 01442 800400

Initial Consultation, Examination and Treatment £125 (allow 45 mins)

Follow-up Examination and Treatment £50 (allow 30 mins)

See the Results of Afferent Input

for yourself
Low back pain solved by identifying a tooth problem
Low back pain solved by identifying a piercing problem
More strength from removing a piercing
Arthritic hips and weak neck solved by removing metal from the mouth


  • In my mid 50s and fairly sporty – I developed a hip ache, aching joints, discomfort in my foot, pain when kneeling and various other “niggles” which physiotherapists and my osteopath couldn’t find a long term fix for. My Yoga instructor suggested I visit this clinic and saw a kinesiologist. I googled it initially and had it not been for the recommendation from her I would have been put off by the on line video of kinesiology in practice as their appeared to be very little “hands on” treatment. However, the result was astonishing! After the first half an hour of treatment I skipped out of the clinic without foot pain, was diagnosed and treated for thyroid problems (who knew?) had a hernia sorted out (again, a surprise to me) and my hip pain totally disappeared. Since then I’ve had one more visit after having a mercury filling removed from a tooth to finalise all the corrections and complete the treatment and feel better than ever. I realise now that just because we’re getting older we should not accept aches and pains as a natural progession of ageing! I now have a three month maintenance check up to ensure everything is working correctly and prevent future potential problems from developing. Worth every penny. –

    It turns out aches and pains aren't normal
  • I’ve been applying your afferent input technique for a couple of months now, and am happily amazed by some of the results!

    Several of my “old” patients are now a lot better because of a nervous system irritant that was still hindering them. My favorite case is still a 16 year old girl with a two year history of headaches, dizzyness and a once-a-month attack of epilepsia. After taking out her belly button piercing and 5 adjustments she hasn’t had a headache, hasn’t been dizzy nor had epilepsia. Super! As a result, now I am treating her mother and father as well.

    Health Professionals love it
    Annette Burke - Chiropractor, Holland.
  • 13 years ago, I had a car accident where I apparently suffered whiplash. As a result, I suffered acute back problems, culminating in me slipping two discs when I fell down the stairs. I spent thousands of pounds on reflexology, Chinese homeopathy… I just wanted to find something that worked! My local chiropractor thought it might be linked to my crown (the same year as my accident, I’d had a metal crown put in) and put me in touch with Simon.

    I can remember my husband saying at the time what have you been told now! So we both went and visited Simon in Berkhamsted, and Simon asked me to do the dumbbell test, where he asked me to lift a dumbbell with my left and then my right hand. My right hand just wouldn’t move until he told me to cover my crown, and then yes, I could move it! On Simon’s advice, I had the crown removed and replaced with a non-metal version. I can honestly say that my back has improved ten-fold, instantly my strength came back… I’m no longer on tablets every day and I’m not crying every day.

    I'm not Crying Every Day
    Karen, Stockport

Simon's articles

Osteoarthritis of the hips

The Most Important Tests for Low Back Pain

X-Rays and MRI scans are popular tests for low back pain but they may not be the best tests for an accurate diagnosis.
Read More
Osteoarthritis of the Knee

The Best Tests for Knee Osteoarthritis

It's easy to find the cause of osteoarthritis when you use afferent input muscle testing. Find out how it works.
Read More
Osteoarthritis of the Knee

Why You’re Still Hurting

If your pain has lasted more than 3 months, or if there are certain movements you can’t do any more, it’s important to have your muscles checked for inhibition.
Read More

Considering Knee Replacement?

If you or someone you know is considering Hip or Knee Replacement surgery, you need to watch this video.
Read More

How to Increase Flexibility Without Stretching

Sometimes no amount of stretching and foam rolling will make you more supple. Watch this video to find out muscle testing can identify the hidden reasons behind your lack of...
Read More


Find out whether you have osteoarthritis (wear and tear) or inflammatory arthritis. Links to your best treatment options in Berkhamsted.
Read More

Learn About Afferent Input

 Simon King specialises in Afferent Input. Every nerve message that controls your movement and you thoughts has to start from somewhere. So do you know what produces nerve messages? Hint...
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Is Metal Part of the Problem?

Ever wondered why you’re feeling weak and out of whack? Here are the top five most surprising causes of muscle weakness and pain. With a painless examination, an Afferent Input...
Read More