Calf pain

Calf problems are closely related to problems with the Achilles tendon or heel spur (plantar fasciitis). Since the plantar fascia transitions into the Achilles tendon and calf musculature, the cause of pain may be found in these three areas among others. In most cases, the patient has begun to limp and their whole body is out of balance. Integrated therapy for this problem is therefore important, which means including the entire body (from head to toe) in training.

In the kybun shoe or on the kybun mat, a natural rollover is possible and the foot can move freely in all directions. This relaxes and stretches the calf musculature and alleviates pain or cramping. Blood circulation is also stimulated, which speeds up the healing of an injury (pulled muscle).


The Achilles tendon (Tendo calcaneus or Tendo Achillis) is the common final tendon of the three-headed calf muscle (Musculus triceps surae), consisting of the two-headed calf muscle (Musculus Gastrocnemius) and the soleus muscle (Musculus soleus) to the heel.

See also: Heel spur or Haglund’s exostosis

Pain in the Achilles tendon can also come from the heel.


There are various possible causes of calf pain. Some of these are:

  • Cramping
  • Injury (pulled muscle)
  • Venous insufficiency
  • Arterial insufficiency
  • Varicose veins
  • Thrombosis in a deep vein

Calf pain that only occurs in the kybun shoe/on the kybun mat may be caused by the following:

  • Initial reaction: In conventional shoes, a normal rollover of the foot was hardly possible. In the kyBoot, the Achilles tendon/calf are stretched during rollover of the foot, which can lead to symptoms such as pain in the calf.
    Tips: 1) Take smaller steps, keep your body upright 2) Perform kybun exercises (interval) 3) Take kyBoot breaks
  • Unstable foot position in the kybun shoe, e.g. twisting to the inside or outside
  • Body posture (bent forward?)
  • Steps too long
  • Other cause/illness: e.g. heel spur, venous insufficiency, circulatory problem (see above)

Unfortunately these causes cannot be addressed through kybun training. Nevertheless, walking in the kybun shoe/standing on the kybun mat can be good for the affected individual and offer relief.

Long-term consequences

Pain in the calf prevents a natural gait.
The affected individual starts limping and therefore automatically puts excessive strain on other joints, for example the foot on the sound side, the knees or the back.

Conventional therapy

  • Regular stretching of the calf musculature
  • Cooling, e.g. with ice
  • Load reduction
  • Relief for the muscle. The basic stress can be relieved by increasing the heel height (only in the short term, otherwise shortening occurs)
  • Rubbing with salves
  • Special bandages
  • Sensorimotor insoles

The kybun principle of operation – being proactive

We recommend wearing the kybun shoe at all times if possible.

Wearing the kybun shoe makes a natural rollover of the foot possible, which activates the long muscles of the foot and massively increases blood circulation in the calf muscles and Achilles tendon. Cramping or pain is reduced over time and may even disappear entirely. In case of a pulled calf muscle, substances that cause pain are transported away more quickly and the muscle heals faster.

Initial reactions

Specific initial reactions with calf pain:

Your symptoms (pain) may well get worse in the beginning. Try to persevere and only take off the kybun shoe if it gets very uncomfortable. The more often you wear the kybun shoe, the sooner the calf musculature can regenerate.


Click here for the general initial reactions experienced by kybun mat and kybun shoe beginners: Initial reactions

kybun exercises

For information about the special kybun shoe exercises or the basic kybun mat exercises , please click here: kybun exercises

Application tips

  • Avoid standing in the kybun shoe/on the kybun mat for long periods of time, and keep moving as much as possible (for standing activities: walk in place)
  • Do not make your steps too long
  • Be sure to maintain an upright body posture
  • Correct the foot position if you notice lateral/medial rolling of the ankle joint
  • Wear the kybun shoe as often as possible. Integrate the kybun mat and kybun shoe into your daily routine
  • If you want to boost the training effect at home, the kybun mat is the ideal training device. Do as much housework as possible on the kybun mat (e.g. ironing)
  • Make sure that your feet (especially the lower leg muscles and ankle joints) are always warm. This promotes blood circulation and the healing process
  • Stretch your calf musculature several times a day (the first time in the morning after getting up, once you have walked for a while)
  • Especially in the morning, the kybun shoe should be worn starting with the first step if possible in order to gently release night time agglutination in the morning
  • Do not try to force anything. If the pain gets worse, give the long muscles of the foot a break and provide relief with the kybun exercises

Opinions/customer testimonials

kybun shoes ideally combine three important factors of healthy and pleasant walking in shoes – the springiness of every step, comfort – thanks to the perfect shape and spaciousness of the shoe – and easy lower extremities workout and exercise just through regular walking, thanks to the principle of the unstable underfoot. Engaging maximum muscles of lower extremities as well as the torso automatically leads to their strengthening. Involving all muscles in regular walking also results in significant performance boost of the “muscle pump”, which has a wholesome effect on the venous and lymphatic system of lower extremities. Walking in these shoes therefore relieves chronic back and joint pain, is beneficial for overstrained tendons and ligaments and last but not least it can reduce tension and pressure in calves. The main use of kybun shoes is for me walking on hard surfaces – walking to work in the city, intensive city tourism (excursion tours, etc.). But you will greatly benefit from them in lighter terrain as well. Put on the kybun shoes and your feet will be grateful to you!! On top of that, they are just comfy to walk in…
I’m almost completely pain-free now. I have better circulation, particularly in my legs. I no longer get cramps in my calves and leg muscles. Like I said earlier, I can walk without any problems.
I bought my first pair of kybun shoes last autumn, as I was still struggling with the consequences of the accident I had in the summer of 2013. The torn muscle fibres in my right calf were very persistent. I underwent six months of physiotherapy and had an ultrasound (showing a 15 cm haematoma between fibres), X-rays and an MRI. After that, I had another round of physio with shockwave therapy. I also received acupuncture treatments and intense massages. Things seemed to be getting better in the short term, but the breakthrough result appeared to be just out of reach. I had severe pain in my right foot every time I stood up, and this mystified my doctors. Why am I experiencing pain in my foot when it was my calf muscles that were damaged? I decided to try out kybun shoes in October 2014. The staff members in the shop were friendly and provided very good advice, and I left with a pair of shoes. I’ve been wearing the shoes all day since then, when I’m on the go as well as at the office. I’ve even gone on a few gentle hiking wearing them. Despite the pain and against the advice of my GP, I have continued to take part in my favourite sport – partner dance (mostly disco swing and jive or in other words, the types of dance that involve a lot of movement). Alongside that I’ve been doing weekly strength training and stretching exercises, among other things. My GP organised an appointment for me in the Etzel clinic in the autumn and called in a sports doctor especially to handle my case. I got an appointment for 22 January 2015. However, my pain was gradually decreasing, and when it came to the time of the appointment, I had no pain at all. My GP still advised me to go to the appointment. The doctors at the clinic were amazed. They took X-rays and asked a lot of questions. How is it possible? They could no longer see any symptoms. The two specialists could only agree on the fact that the X-rays no longer showed any abnormalities. One of them thought that a minor insole could counteract the mild inward bend of my foot (why?). The sports medicine specialist believed I had done everything correctly. STAY MOBILE! He praised the work I had put in and my choice of physiotherapy methods (shockwave therapy and acupuncture). He emphasized how he believed that the constant mobilisation relieved the pain in my foot. This is all thanks to my kybun shoes. He advised me to continue doing what I have been doing – wearing kybun shoe shows, taking part in sport, and dancing. He was firmly against the insoles! The pain was the result of the relieving posture I had been using from the time of my accident, which I continued to use for a long time after the accident. Continuously freely moving my foot allowed me to get out from the pattern I was stuck in almost unnoticed. Well, all I can say is: Thank you so much.

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