How to Audit Ergonomic Claims in Strength Equipment

Key Takeaways

• Ergonomics is compatibility, not comfort alone. It integrates user characteristics, task demands, controls, feedback, physical interfaces and context.
• Adjustment count is not the same as accommodation. Useful settings must cover the intended population, engage securely and be easy to identify and reproduce.
• Safety and efficacy require different evidence. A structurally compliant product has not thereby proved better mechanics, performance or injury outcomes.
• Equipment can change an exercise condition. Bench angle, stability, grip constraints and support geometry can affect what the athlete actually performs, but results are protocol-specific.
• Injury-reduction language requires prospective clinical evidence. Fit, comfort, modeled loading and acute performance cannot substitute for measured injury outcomes.
• AMM’s direct evidence belongs to the Launch Pad®. Joint Ops™ is in active prototype research with no published outcomes; it must be evaluated directly.

Start With the Claim, Not the Feature

Karwowski describes ergonomics and human factors as a discipline concerned with human-compatible systems, spanning physical, cognitive and organizational dimensions [1]. ISO 9241-210 translates that idea into a human-centered process: understand users and context, specify requirements, produce design solutions, evaluate them with users and iterate [2].

The terms overlap, but they are not interchangeable with “comfortable.” Physical ergonomics includes anthropometry, strength, reach, posture and contact. Cognitive ergonomics includes how a person perceives labels, remembers settings and recognizes an error. Organizational ergonomics includes the workflow of a shared facility: supervision, transition time, maintenance and the consequences of a misconfigured station.

Four Verification Bays for an Equipment Claim

Articles 01 and 02 own the human-centered design process and bench specification. This article takes the evaluator’s position: a manufacturer, facility owner, coach or researcher arrives with a claim and asks what evidence would make it credible.

Bay 1 · Does the Equipment Accommodate Its Intended Users?

Body dimensions influence reach, clearance, support and joint alignment. Stature alone is inadequate: two athletes of the same height can differ in torso breadth, segment lengths, shoulder width and limb proportions. Equipment designed around an “average” user may therefore fit fewer people than expected.

The design response is not always continuous adjustment. Some dimensions can be fixed around a carefully defined population; others may require discrete sizes or indexed positions. Garneau and Parkinson showed how anthropometric data and the user’s just-noticeable difference can be incorporated into models of physical accommodation for adjustable and discretely sized products [3]. The practical lesson is that a setting must differ enough to matter while offering enough range to cover intended users.

Accommodation must also be tested during the exercise. Foam compresses under load. Clothing changes friction. A cable or lever may approach the body differently at the end of a range. Static measurements identify candidates; observed use confirms whether the task is actually accommodated.

Bay 2 · Can Users Configure It Correctly and Repeatably?

A machine with many positions can still create poor outcomes if its controls are ambiguous. Good indexing shows where the equipment is set, communicates full engagement and lets another user reproduce the setup. In a team facility, adjustment time affects workflow. In maximal training, a partially engaged lock is a safety problem. In research, an undocumented setting is a confounder.

Bench angle illustrates why settings are part of the exercise prescription. Lauver and colleagues found that upper-extremity muscle activation changed across bench inclinations [4]. If the back angle is not known or two benches use different nominal increments, the sessions are not mechanically identical. More adjustment is valuable only when the range serves a real task and users can select it consistently.

Feedback should be redundant where consequences are high: visible index numbers, tactile detents and positive mechanical engagement can each confirm the same state. The correct combination depends on environment, cleaning requirements, lighting, noise, gloves and supervision.

Bay 3 · Has Safety Been Tested Without Smuggling in Efficacy?

ISO 20957-1:2024 specifies general safety requirements, test methods and equipment classifications for indoor stationary training equipment [5]. Part 2 adds requirements specific to strength-training equipment [6]. Those requirements belong at the foundation of design. Capacity, stability, entrapment hazards, controls, instructions and foreseeable use all matter before an athlete begins evaluating performance.

Performance claims sit above that foundation. A load test does not show that a machine produces more strength. A compliant pad does not show reduced shoulder loading. A secure adjustment does not show that athletes choose it correctly. Each statement needs a method matched to the endpoint.

Bay 4 · Does the Equipment Change the Measured Task or Outcome?

The bench press demonstrates why ergonomics cannot stop at fit. Grip width, torso position, support, angle and stability can alter the work performed even when the exercise name stays the same.

In 35 strength-trained adults, Mausehund and colleagues measured net joint moments and EMG across grip widths and elbow positions. Wider grips increased shoulder moments, while narrower grips shifted more demand toward the elbow extensors and shoulder flexors [7]. A separate 34-person study found substantial technique differences between powerlifters and recreational lifters and differences in joint-moment distribution by sex [8]. Equipment that accommodates one technique may not fit every athlete identically.

Torso position matters as well. Cudlip and colleagues compared arched powerlifting and standardized techniques in 20 experienced men. The arch increased latissimus dorsi activation, while the standardized technique produced 8% larger integrated shoulder moments [9]. The bench did not act alone, but it provided the boundary against which the torso position was created.

Null Results Belong in the Audit

Goodman and colleagues asked whether replacing a flat bench with an exercise ball changed 1-RM, upper-body and trunk muscle activity or elbow ROM. Thirteen participants completed both conditions after familiarization, with tests separated by at least seven days [10].

This study should not be generalized into “surfaces never matter.” Its value is methodological. It shows that equipment changes can produce null results and that evidence-based design must publish and respect them.

Modeled Mechanics and Injury Outcomes Are Different Evidence

Noteboom and colleagues tested 10 experienced strength athletes across 21 combinations of grip width, shoulder-abduction target and scapular pose. They recorded motion and hand forces and used an OpenSim model to estimate shoulder reaction forces and muscle activity. Grip width, scapular pose and lateral hand forces affected selected modeled loads [14].

The study advances bench-press biomechanics, but its limits are central to ergonomic interpretation. Participants used a 16 kg bar; the sample was small; the “released” scapular condition used a pool noodle; and injury was not measured prospectively. Modeled load changes can support design hypotheses. They cannot establish that a bench or pad prevents an injury.

An updated systematic review of 17 weightlifting and powerlifting injury reports found injury incidence estimates of 1.0–4.4 injuries per 1,000 training hours and identified the lower back/pelvis, shoulder and elbow/upper arm among the common sites. The authors also emphasized heterogeneous study designs and definitions [15]. Those epidemiological findings establish that injury is a relevant problem. They do not identify a bench feature as the cause or show that ergonomic equipment reduces incidence.

AMM as a Worked Claim-Audit Example

The Launch Pad studies are relevant to ergonomics because they test a support condition rather than relying on appearance or testimonials. In the randomized crossover study, 10 resistance-trained men performed five repetitions at 70% 1-RM under flat and Launch Pad conditions. The Launch Pad produced approximately 24–27% greater pectoralis activation, 15.8% greater peak velocity, 17.5% greater mean velocity and 15.8% greater vertical bar displacement. Power was approximately 8.8% greater but not statistically significant [16].

A four-week randomized parallel trial assigned 42 intermediate-trained men to the same supervised eccentric-overload program using either the Launch Pad or flat condition. Average 1-RM gain was 18.4 kg (40.6 lb) versus 11.1 kg (24.5 lb): a 7.3 kg (16.1 lb) absolute difference, approximately 66% greater average improvement, p < .001 [17].

An eight-week trial randomized 30 collegiate football players to the two support conditions within identical periodized training. The Launch Pad group improved more in 1-RM, NFL-225 repetitions and seated medicine-ball throw distance; all reported between-group comparisons were p < .001 [18].

These studies provide direct acute and longitudinal product evidence. They do not establish clinical benefit, injury reduction or direct efficacy of Joint Ops. Nor do they prove that the acute activation, velocity or vertical-displacement differences caused the later performance changes. The responsible chain is a different interface, different acute repetition characteristics, repeated exposure and different longitudinal outcomes.

Run the Audit Where the Equipment Will Be Used

For athletes and coaches

• Record bench, angle, seat setting, rack height, grip and support condition when comparing performance.
• Match the apparatus to the goal: competition-standard equipment for specificity, alternative configurations for defined supplemental tasks.
• Use comfort as feedback, not proof. A preferred setup may still need velocity, ROM or reliability data before a performance claim is made.
• Stop treating an unclear adjustment as user error by default; labels, detents and lock feedback are design responsibilities.

For facility owners

• Evaluate the actual user population, including shortest and tallest intended athletes, mobility limitations and accessibility needs.
• Test transition time, cleaning, serviceability, floor stability and instruction comprehension before purchasing at scale.
• Require clear load ratings and standards information, but do not confuse those documents with outcome evidence.

For equipment designers and researchers

• Define a measurable requirement for every feature.
• Test fit and usability before using expensive biomechanical or longitudinal protocols.
• Report apparatus dimensions, upholstery, settings and instructions in enough detail to reproduce the condition.
• Publish null findings and limitations; they are part of a credible design program.

Relevance to The Launch Pad® and Joint Ops™

The Launch Pad®

The Launch Pad is a human-equipment interface with direct data for selected acute and performance outcomes. Its ergonomic rationale includes torso support, shoulder-clearance intent, traction and repeatable positioning, but claims should remain tied to what the published studies measured. Injury prevention and treatment are not established.

Joint Ops™

Joint Ops incorporates selectable surface configurations, adjustable lumbar positioning, torso support, seat geometry, multiple bench angles and repeatable indexing. Active prototype research is underway, but no published Joint Ops outcome is available. The complete platform must pass the four bays on its own; Launch Pad data cannot be relabeled as Joint Ops data.

What the Evidence Shows