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Underwater treadmill

Product information

We believe that the underwater treadmill is the next step in active rehabilitation. Because of buoyancy, resistance and hydrostatic pressure of the water, the patient can start underwater walking exercises almost immediately.

Our EWAC movable floors make it possible to house an integrated underwater treadmill, meeting the highest norms regarding usability, adjustability and operational stability. When mobility is key or you don’t have one of our floors, we offer a drop-in treadmill. For pools without a movable floor, our drop-in lifting system will still allow you to change depth while running in order to provide the best exercise environment.

Knowledge about underwater treadmill

Exercising on an underwater treadmill is an excellent combination of weight bearing reduction, while at the same time the patient can perform walking exercises to mobilize otherwise stiff or injured joints.

Aquatic treadmills are the pinnacle of underwater exercise equipment, and can be used for low impact obesity treatment. The strict walking rhythm it imposes has added value in neurology.

We offer the biggest collection of publications about hydrotherapy.


EWAC Medical has been designing and building movable swimming pool floors for over 25 years and has successfully finished more than 1.000 projects worldwide. We continually work on improvement and innovation. Even though Aquatic treadmills are a relatively new development, experience with these products is increasing rapidly. Underwater treadmills can be integrated in any of the current EWAC Medical products which makes our proposition incredibly competitive.

That is why EWAC Medical is world market leader in hydrotherapy.



More information

Underwater treadmill functionality

Exercising on an underwater treadmill combines the favourable effects of water during the execution of stationary walking exercises. An underwater treadmill turns the pool into a virtually endless pool; the patient does not have to turn at the end. Water has lots of favourable effects on the rehabilitation process. Because of the buoyancy, weight bearing in the legs is reduced, which makes it easier for an injured patient to exercise. At the same time, the warm water makes the ligaments more elastic and therefore range of motion is increased. As an added bonus, submersion in water reduces pain sensation.

All these effects added together makes the underwater treadmill an excellent piece of exercise equipment, that can be extremely useful for obesity treatment, sports endurance training and general rehabilitation of leg problems.

The strict rhythm imposed by the underwater treadmill can be very helpful in treating neurological patients.

Integrating an underwater treadmill in a movable swimming pool floor enables the user to adapt the loading on the patient’s lower extremities to the stage of the rehabilitation process. A completely integrated underwater treadmill makes it possible to perform walking exercises at different body loads. It is possible to remove the parellel bars, which clears the whole area of the movable swimming pool floor for other hydrotherapy methods.

The underwater treadmill can be fitted in any new pool floor, but can also be excellently fitted in existing EWAC Medical movable swimming pool floors.

EWAC Medical does not only supply underwater treadmills, but also contributes actively in acquiring and dispersing knowledge about hydrotherapy. We are also actively involved in developing new underwater exercise equipment for rehabilitation purposes. On this page you will find more in-depth information about all the aspects that come into play when applying an underwater treadmill.

The proven value of exercising on an underwater treadmill

Exercising on an EWAC Medical underwater treadmill offers a great number of advantages.



– Actuated with safe low voltage power drive – Optimal security of patients is guaranteed
– Infinitely adjustable speeds from 0,1 up to 11 km/h – Precise control of exercise intensity
– Slow up and down tuning during start and stop – Pleasurable walking experience
– Patient training program can be stored – Follow progress of the rehabilitation process
– Can be mounted into an existing pool – Added functionality of existing situations
– Can be mounted in a modular pool – Added functionality of existing and new situations
– Can be integrated in an adjustable floor – Adjust for optimal weight loading of the patient
– Can be retrofitted in existing adjustable floors – Increase the possibilities of a current installation
– Flush with deck of adjustable floor – More functionality within the same available space
– Active interaction in the water between patient and therapist – Therapist can actively manipulate the patient during exercises

Overview of our options (see our product configurator)

Underwater camera This special underwater camera enables the therapist to track the movements of the patients, and if necessary record the movements for further analysis. By comparing images from multiple sessions one can get a clear picture of the progress made by the patient.
Counter current unit or Jetstream Countercurrent unit or jetstream. A jetstream offers exercise resistance to the patient moving against the flow. A wall nozzle produces a strong water jet which is aimed at the patient, and depending of the required exercise load, can be softened with air.
Underwater lighting Underwater lighting is highly recommended to improve the sight through, for example, an underwater window. The lighting can be either delivered in monochrome or in colours.
Observation windows Observation windows can be placed in regular pools as well as modular pools. Observation windows enable the therapist to supervise the executions of the patient optimally.

Two types of underwater treadmills

EWAC Medical supplies two different underwater treadmills:

Integrated underwater treadmill in an adjustable pool floor
The integrated underwater treadmill is completely flush with the adjustable pool floor. Weight bearing of the patient can be adjusted by lowering the adjustable floor. From young children to adults, in any stage of rehabilitation, the combination of an underwater treadmill with an adjustable floor offers an excellent exercise environment.
When the treadmill is not used, removing the parallel bars frees the entire area of the exercise pool for other underwater exercises.

The underwater treadmill can be fitted in any new adjustable pool floor, but can also be excellently retro-fitted in existing EWAC Medical adjustable floors.

Drop-in underwater treadmill
For existing pools with a fixed depth the drop-in underwater treadmill is an excellent piece of exercise equipment. The freestanding underwater treadmill can be placed in any position on the bottom of the swimming pool. The drop-in underwater treadmill turns the pool into a multi role, low impact exercise environment. The underwater treadmill can be completely removed out of the pool, to clear the available space for other underwater exercises.

It can be used in virtually any existing pool situation and works plug and play. Both underwater treadmills meet the demands set in the ISO-norm 13485.

Technical specifications

Drop-in underwater treadmill Intergrated underwater treadmill
Dimensions – Total L 1540 x B 1040 x H 1740 mm (including handrails) Dimensions – Total L 1750 x B 1200 mm
Dimensions – Training area L 1150 x B 550 mm Dimensions – Training area L 1400 x B 850 mm
Speed capabilties 0,1 – 11.0 km/h Speed capabilities 0,1 – 11.0 km/h
Power supply 16 Amp 220/240 V single phase 50/60Hz Power supply 16 Amp 220/240 V single phase 50/60Hz
Maximum load 500 kg Maximum load 500 kg



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Integrated underwater treadmill

An underwater treadmill designed to fit perfectly in one of our movable swimming pool floors.

Drop-in underwater treadmill

An underwater treadmill able to be moved in and out of the pool regardless of its environment.

Underwater treadmill lifting system

A lifting system specially designed for the drop-in underwater treadmill to be lowered in any aquatic environment.

Product Videos


Chen (2021) Combined effect of hydrotherapy and transcranial direct-current stimulation on children with cerebral palsyMa (2022) Overall treatment efects of aquatic physical therapy in knee osteoarthritis a systematic review and meta-analysisSong (2022) Effects of Aquatic Exercises for Patients with Osteoarthritis Systematic Review with Meta-AnalysisPrins (1999) Aquatic therapy in the rehabilitation of athletic injuriesJung (2018) The influence of water depth on kinematic and spatiotemporal gait parameters during aquatic treadmill walkingJara (2019) Aquatic treadmill walking at three depths of water in people with traumatic brain injuryKwok (2022) The effect of aquatic High Intensity Interval Training on cardiometabolic and physical health markers in women: A systematic review and meta-analysisLambeck (2022) IATF expert opinion Enhancing the quality of aquatic therapy for subacute and chronic stroke patientsPark (2014) The Effect of Underwater Gait Training on Balance Ability of Stroke PatientsGuidelines IOAPT practise Aquatic Therapy in Corona timesFelten-Barentz et al (2018), Patient views regarding the impact of hydrotherapy on critically ill ventilated patients: A qualitative exploration studyChen (2021) Rehabilitation effects of land and water-based aerobic exercise on lung function, dyspnea, and exercise capacity in patients with chronic obstructive pulmonary disease (COPD)Zotz (2013) Aquatic physical therapy for Parkinson’s diseaseWaller (2017) Effects of high intensity resistance aquatic training on body composition and walking speed in women with mild knee osteoarthritis: a 4-month RCT with 12-month follow-upTaylor (2003) The ventilated patient undergoing hydrotherapy – a case studyMorer (2020) Evaluation of the Feasibility of a Two-Week Course of Aquatic Therapy and Thalassotherapy in a Mild Post-Stroke PopulationCuesta-Vargas (2020) Identification of Tools for the Functional and Subjective Assessment of Patients in an Aquatic Environment A Systematic ReviewGraca (2020) Immediate Effects of Aquatic Therapy on Balance in Older Adults with Upper Limb Dysfunction: An Exploratory StudyChien (2020) Land versus water HIIE (HIIT) effects on muscle oxygenation and physiological parameter responses in postmenopausal women (Scientific Reports by Nature)Hall (2004) Cardiorespiratory responses to aquatic treadmill walking in patients with rheumatoid arthritisDenning (2010) Underwater Treadmill Exercise as a Potential Treatment for Adults With OsteoarthritisRoper (2013) Acute Aquatic Treadmill Exercise Improves Gait and Pain in People With Knee OsteoarthritisBressel (2014) High intensity interval training on aquatic treadmill in adults with osteoarthritis: effect on pain, balance, function and mobilityNiks & ‘t Hoofd (2017) Aquamentia, Introducing a Newly Developed Swimming Intervention for People With DementiaAndrade (2017) Oxygen uptake and body composition after aquatic physical training in women with fibromyalgia; A randomized controlled trialLim (2014) The Influence of Short-term Aquatic Training on Obstacle Crossing in Gait by the ElderlyBarbosa (2014) Effect of Watsu therapy on psychological aspects and quality of life of patients with temporomandibular disorderPérez-de la Cruz (2020) Comparison of Aquatic Therapy vs. Dry Land Therapy to Improve Mobility of Chronic Stroke PatientsHeywood (2018) Force during functional exercises on land and in water in older adults with and without knee osteoarthritis; Implications for rehabilitationAyan (2015): Parkinson systematic reviewFelten-Barentz et al (2015), Feasibility and Safety of Hydrotherapy in Critically Ill Ventilated PatientsBrugghemans (2011) Parkinson gait balance endurance (dutch)Squires Blackwell (2012) relationship of metabolic costs of aquatic treadmill versus land treadmill runningPohl (2003) The physiological responses to running and walking in water at different dephts

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