ZeroG

2DTracking
10–200 lbsDynamic BWS
20–450 lbsPatient weight

The #1 choice of the world's leading rehabilitation programs.

The original robotic body-weight support system, ZeroG pioneered dynamic BWS — and remains the standard the rest of the field is measured against. Born from research and refined since 2009, it delivers the reliability, safety, and clinical performance that elite rehabilitation centers demand. For programs that won't compromise, ZeroG is the premium choice.

Overview

When centers demand the best.

Leading rehabilitation programs don't settle, they choose the system that started it all. ZeroG set the standard for robotic body-weight support, and continues to define what safe, effective, full-effort therapy looks like. When the stakes are a patient's recovery, centers trust the original.

  • Precise Performance Smooth, responsive support that moves with the patient, responding instantly to every change in motion.
  • Gait & Balance Train walking, turning, and reactive balance recovery with fall protection backing every step.
  • Safely push boundaries Rehearse real-world tasks and high-stakes activities patients couldn't safely attempt any other way.
Child cheering in a ZeroG harness during a step exercise with a clinician
Features

Inside the system that
started it all

Explore the capabilities that have made ZeroG the trusted gold standard in robotic body-weight support.

Lunge training with dynamic body-weight support
Dynamic Body-Weight Support + Explore
Dynamic BWS

Dynamic Body-Weight Support

Offloads a precise portion of the individual's weight and holds it constant through vertical movement — making challenging activities both achievable and safer.

Patient performing a kneeling exercise with constant support

Functional Training

Support stays constant through the most demanding phase of a movement, never fluctuating. Clinicians can adjust the level of BWS to progress the challenge for each task or session by session.

Constant Support

With support that never wavers, patients can give full attention to the movement in front of them — building strength and confidence rep after rep.

Patient taking first steps with a walker and constant ZeroG support beside a clinician

First Steps

Dynamic BWS gives patients the support to take their first steps. As strength returns, the clinician can decrease the level of support so they do more under their own efforts.

Repetition

Repetition drives neuroplasticity. By making each rep easier, dynamic BWS helps patients practice functional tasks more often and for longer.

Reactive balance training with TRiP perturbations
TRiP Perturbations + Explore
TRiP Perturbations

Train reactive balance, safely.

TRiP delivers controlled, repeatable balance perturbations — calibrated tugs that provoke genuine recovery reactions and train the automatic responses patients need to catch themselves in the real world.

Patient walking while a clinician guides reactive balance from behind in a ZeroG harness

Reactive Balance

Calibrated perturbations provoke real stepping and reaching reactions, building the automatic responses that protect against a real-world stumble.

Customizable Intensity

Set the direction, magnitude, and timing of every perturbation to match the patient, progressing the challenge session by session.

Safe by Design

Every perturbation is backed by fall protection and dynamic body-weight support, so patients can be pushed to the edge of their balance without the risk of injury.

Hands-free fall protection during overground gait training
Fall Protection + Explore
Fall Protection

Push limits, without the risk.

Fully customizable for a pre-defined distance or velocity-based response — fall protection adapts to every activity and patient.

Child smiling in a ZeroG harness during a sit-to-stand exercise with a clinician

Build Confidence

Patients push their limits and build confidence to try new tasks, knowing they are protected from a fall and injury.

Hands-Free Therapy

Stay hands-free to expand the possibilities, giving patients the opportunity to participate in activities they otherwise could not attempt safely.

Patient on a therapy ball supported by ZeroG fall protection

Customizable

Dial in the fall protection for each activity. Limit the descent to as little as an inch so the patient can be kept securely in place for high-stakes balance tasks.

Disabled

For floor-based activities or higher-level patients, disable fall protection entirely for full freedom of movement — still with the security of dynamic body-weight support.

ZeroG overground gait training with a clinician and walker
Customizable Tracking + Explore
Customizable Tracking

Tailored to the patient, tuned to the task.

ZeroG moves with the patient and shapes how support is delivered — facilitating, resisting, or holding steady overhead — so every step matches the goal of the session.

Child in a ZeroG sling pushing a toy cart during play-based therapy

Walk, Turn, Explore

Children move naturally as they walk, turn, and explore along the track, keeping young patients engaged.

Always Overhead

The robot moves with the patient along the track, keeping support directly overhead through every step — ideal for those first steps and overground gait training.

Patient walking in a ZeroG sling alongside a therapist

Customizable Tracking

Set the robot to move freely with the patient, add resistance to build strength and endurance, or facilitate movement to help carry them forward to match each patient's goals.

Lock for Stability

For patients who need a fixed base of support, the ZeroG trolley can be locked in place — holding a stable overhead anchor point for a secure, controlled therapy session.

ZeroG touchscreen interface on a mobile stand in a therapy room
User Interface + Explore
User Interface

Operate correctly from day one.

Intuitive, plain-text labels built to FDA human-factors guidelines — so any clinician can operate ZeroG correctly from day one, without decoding icons or memorizing a new visual language.

Ease of Use

The clinician can use the touchscreen or the hand-held remote during a session — whichever is most convenient for them.

Touchscreen Computer

A large touchscreen that plugs in anywhere convenient to the clinician.

ZeroG therapy gym: patient walking with a therapist beneath the overhead ZeroG, touchscreen computer at right

Hand-Held Remote

With the remote in hand, the clinician can adjust body-weight support, fine-tune fall settings, and dial in TRiP, all without interrupting the session.

Aretech crew installing a ZeroG track
Turnkey Installation + Explore
Turnkey Installation

One team, start to finish.

Aretech engineers plan every ZeroG installation in-house, completed by experienced crews who exclusively install our technology.

Customizable Track Layouts

Designed to the room, every track is engineered around your clinical space, workflow, and traffic flow — straight runs, ovals, L-shapes, and fully custom paths.

Diagram of customizable ZeroG track layouts — straight, L-shape, and custom paths

Planned In-House

Every installation is planned in-house by Aretech engineers — one team, one source, full accountability.

Full Accountability

From the first site visit to the final handoff, the project stays with us start to finish.

ZeroG installation crew mounting the overhead track
Clinical Evidence

Double the functional gains.

In a study at the University of Kentucky, patients with acute traumatic brain injury who trained with ZeroG during inpatient rehabilitation more than doubled the functional gains of patients receiving standard-of-care therapy — improving their overall FIM score by 59.7 points versus 21.1 (p = 0.007).

The Functional Independence Measure (FIM) tracks how independently a patient can perform everyday motor and cognitive tasks. ZeroG patients also made significant gains across motor and cognitive FIM, including self-care, mobility, locomotion, and social cognition.

Anggelis E, Powell ES, Westgate PM, Glueck AC, Sawaki L. “Impact of motor therapy with dynamic body-weight support on Functional Independence Measures in traumatic brain injury: an exploratory study.” NeuroRehabilitation. 2019;45(4):519–524.

Change in total FIM score
Mean gain from admission to discharge · acute inpatient TBI rehabilitation
+21.1
Standard of Caren = 6
+59.7
ZeroGn = 6
TRiP

Fall Prevention Training.

Most trips and slips happen in motion — while walking and turning, not standing still. Yet traditional therapy often trains balance in place. ZeroG is the only system in the world that lets clinicians safely practice fall recovery while patients are actually moving, building the reactive responses that prevent real-world falls.

Fall Recovery

Real fall recovery, trained.

TRiP delivers controlled perturbations that trigger the compensatory stepping and balance reactions patients need in the real world.

Safety

Push limits, not patients.

Paired with fall protection, clinicians can provoke genuine loss-of-balance responses with no risk to the patient of a fall.

Exclusive

Only in ZeroG.

TRiP is Aretech's patented perturbation technology, integrated into ZeroG to train fall recovery in motion, not standing still.

Proven Outcomes

Patients do better with TRiP.

In a peer-reviewed pilot study at Gaylord Specialty Healthcare, acute stroke patients who trained with ZeroG and TRiP improved their Berg Balance Scale scores by nearly 67% — more than double the gains of patients receiving standard-of-care therapy.

Both ZeroG groups significantly outperformed standard of care, and adding TRiP perturbations produced the largest improvement of all — building the reactive balance strategies that help patients avoid a harmful fall once they return to the community.

Pilot study, Gaylord Specialty Healthcare (Wallingford, CT). Mean Berg Balance Scale percent change from baseline in acute stroke patients; ZeroG groups vs. standard of care p ≤ 0.0178. n = 59.

Berg Balance Scale improvement
Mean percent change from baseline after inpatient rehabilitation
28%
Standard of Caren = 30
53%
ZeroGn = 15
67%
ZeroG + TRiPn = 14
Ecosystem

Flexibility for your space and patients.

Add robots to treat multiple patients at once, extend the track to cover more of your space, and layer in monitoring and harness options that expand who your clinicians can treat.

Two ZeroG robots on a shared overhead track in the same workspace

Additional Robots

Triple your treatment capacity on a single track with up to three robots. Multiple clinicians can run simultaneous sessions, maximizing throughput during peak hours.

Passive Trolley hardware

Passive Trolley

Add additional safe overhead support, in a cost effective manner. The Passive Trolley provides fall protection without requiring a second robot.

Floor-plan diagram of an extended ZeroG overhead track routed around a therapy gym

Extended Track

Add unlimited length to fit your gym. Straight runs, bends, and custom loops let patients train across more of your gym.

Wearable pulse oximeter

Pulse Oximeter

Add real-time cardiovascular monitoring. Track heart rate and SpO₂ to train within prescribed Heart Rate Zones for cardiopulmonary rehab and high-intensity work.

Clinician guiding a patient supported in a ZeroG harness

Harnesses

Equip your program for every patient. Choose from Premium, Support, and Bariatric options accommodating pediatric through bariatric sizes.

Specifications

ZeroG at a glance.

STATIC BWS (MAX PATIENT WEIGHT)
Up to 450 lbs
Dynamic BWS
10-200 lbs
TRACK LENGTH
100-feet Standard · Additional Length Unlimited 
Tracking
Free Walk · Resistance · Facilitation
Minimum Ceiling Height
8'6" standard · 8' with custom low-profile Robot
Harnesses
Premium · Support (non-Velcro) · Bariatric
Electrical
1 × 208–230 VAC, 20 amp · 1 × 110 VAC, 10 amp
Certifications
IEC 60601-1 · FDA Listed · CE MDR
Warranty
2-year hardware · 1-year harnesses

Contact Us

Tell us about your program and an Aretech representative will get in contact with you to learn how ZeroG will fit your space.

Headquarters
22446 Davis Dr, Ste 187
Sterling, VA 20164
Call
571-292-8889
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