
Hydrotherapy
Underwater Rehabilitation
Underwater treadmills and therapy pools for athletes and rehabilitation.
Underwater treadmills
How does underwater rehabilitation work?
The patient walks or runs on a treadmill built into the floor of a warm-water pool, with water level and speed precisely adjustable. Depending on the depth, the buoyancy of the water takes over a large part of the body weight, significantly reducing the load on the joints and spine. This allows exercise therapy to start much earlier after an injury or surgery, without pain. Water resistance and adjustable resistance jets strengthen the muscles at the same time, while hydrostatic pressure helps reduce swelling and supports circulation. With underwater cameras, the therapist can follow and correct the movement pattern in real time. The method is used in orthopaedic rehabilitation, after sports injuries and for endurance training alike.


HydroWorx 500 Series
A built-in premium aquatic therapy pool at an accessible price point: underwater treadmill and resistance jets in a fixed-depth pool for 1–4 patients.
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HydroWorx ECO
The most economical HydroWorx: freestanding plug-and-play aquatic therapy system in just 2.8 m² – underwater treadmill and resistance jets for clinics and wellness programmes.
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HydroWorx RISE
Modular, freestanding underwater treadmill system: HydroWorx's first fully self-contained aquatic therapy unit, deployable anywhere, for rehabilitation, recovery and performance training.
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HydroWorx 350
Compact freestanding aquatic therapy system with 40% more powerful resistance jets and a deep-tissue massage wand – rehabilitation and performance training in a single, installation-free unit.
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HydroWorx 750 Series
Sectional, space-efficient in-ground aquatic therapy pool with a built-in underwater treadmill and a 5-camera diagnostic system – a clinical solution that fits into tight spaces.
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HydroWorx 3500 Series
Large-footprint, expandable aquatic therapy pool for group therapy and athletic programmes – capacity for up to 12 people and three resistance jet pairs.
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HydroWorx 1200 Series
Compact Zero-Entry aquatic therapy pool with a moving floor: level-entry access, up to 168 cm depth and a built-in treadmill – safe, fully accessible rehabilitation for 1–2 patients.
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HydroWorx 2000 Series
Premium Zero-Entry aquatic therapy pool with a spacious treatment area, dual independent resistance jets and a moving floor – for hospital and sports medicine departments.
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HydroWorx Align
Custom-designed concrete pool with up to 4 underwater treadmills – a bespoke institutional aquatic therapy solution.
Details→Contrast therapy pools
How does contrast therapy work?
During contrast therapy the client alternates between immersion in warm and cold water, with precisely adjustable pool temperatures. Cold water makes the blood vessels constrict, which reduces swelling and post-exercise muscle soreness. In warm water the vessels dilate, so the muscles relax and circulation increases. Alternating the two creates a “pumping” effect in the circulation that helps remove the metabolic by-products of exercise. Hydrotherapy jets complement this with massage. The method is mainly used by athletes and teams for faster recovery between training sessions or matches.


Classic Plunge
Proven cold/warm contrast therapy plunge pool – acrylic shell, three sizes, surface or recessed installation.
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Rejuvenate Plunge
Modular contrast therapy pool – originally designed for the Vikings – in seven sizes for 4 to 28 users.
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HydroWorx XLR8
Compact plug-and-play plunge pool with precise 4–40 °C control – single-person recovery, no plumbing required.
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HydroWorx Thrive
Small-group cold/warm contrast therapy, no installation work – Thrive series, up to 6 persons, plug-and-play.
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HydroWorx Thrive ONE
Single-person contrast therapy plunge pool – compact, plug-and-play, no plumbing, for personal recovery.
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HydroWorx Thrive DUO
Two independent cold/warm zones in one system – complete contrast therapy for pairs and small groups.
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HydroWorx Thrive EDGE 12
High-capacity team contrast pool for 8 persons – built-in seating, deep-water zone and 59–67 hydrotherapy jets.
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HydroWorx Thrive EDGE 15
The EDGE 12 extended to 10 persons – large-team contrast therapy pool with 59–67 hydrotherapy jets.
Details→Underwater Rehabilitation – good to know
The HydroWorx range at a glance
HydroWorx manufactures underwater treadmill therapy pools and hot and cold contrast therapy plunge pools. The treadmill range falls into four groups: freestanding units (ECO, RISE, 350), built-in pools (500, 750 and 3500 Series), Zero-Entry pools with a moving floor (1200 and 2000 Series) and the custom-designed Align. The contrast therapy range extends from single-person plunge pools (XLR8, Thrive ONE) to the modular 28-person team pool (Rejuvenate Plunge). The models differ mainly in size, water depth, treadmill speed, jet and camera equipment, and installation type.
Who uses it and for what?
The systems are used by physiotherapy clinics, hospital rehabilitation and sports medicine departments, athletic training centres, professional and university sports teams, and senior care and wellness facilities. Typical applications of the treadmill pools include early mobilisation after injury or orthopaedic surgery, functional treatment of neurological and spinal conditions, gait analysis and gait retraining, balance and muscle-strength development in older adults, and low-impact conditioning for athletes. Depending on water depth, buoyancy reduces body-weight loading by 20–80%. The contrast pools are mainly used for post-training recovery in individual and team recovery programmes.
Freestanding, built-in or custom treadmill pools
The freestanding treadmill units are installed without construction work or external plumbing and, depending on the model, fill in 90 seconds to 3 minutes. The built-in pools come in recessed or raised versions; the panels of the sectional versions are assembled on site, so they can be brought into existing buildings through narrow access routes. In the Zero-Entry pools the patient steps in at floor level and the moving floor then descends to the required depth, which supports safe entry for patients with limited mobility and older adults. For the most complex requirements, Align offers a custom concrete pool, from design through to construction.
Contrast therapy pools: capacity and installation
Contrast pools are chosen mainly by the number of people to be treated at once: there are single-person (XLR8, Thrive ONE), small-group (Thrive, Thrive DUO) and team-sized options (Classic Plunge: 4–8, Thrive EDGE 12 and 15: 8–10, Rejuvenate Plunge: 4–28 people). The Thrive series and the XLR8 are plug-and-play: they run from the mains supply with no plumbing or construction work. The Classic Plunge can be installed above ground or partially or fully recessed, while the Rejuvenate Plunge is built from panels, so it can be relocated and expanded. Depending on the model, water temperature is adjustable between 4 and 40 °C.
