Human-Centered Strength Equipment

Human-Centered Design Is an Engineering Process

Ergonomics and human factors provide the larger intellectual framework. ISO 26800 applies ergonomics principles to the design and evaluation of products, tools, equipment, systems, facilities and environments so they are compatible with human characteristics and capabilities (International Organization for Standardization, 2011). Karwowski describes the discipline in similarly broad terms: the object of design is a human-compatible system, not an artifact considered in isolation (Karwowski, 2005).

ISO 9241-210 is written for interactive systems, but its process is useful beyond screens and software: understand users and context; define requirements; create design solutions; evaluate them against those requirements; and repeat the cycle as evidence accumulates (International Organization for Standardization, 2019). Applied to strength equipment, the “interaction” is physical and consequential. The user is creating force against an external load, often at high effort, and the quality of the interaction can change as fatigue rises.

That definition deliberately avoids declaring one bench, machine or surface universally correct. A competition bench, a multi-angle collegiate bench and a rehabilitation-oriented press can all be human-centered while presenting different constraints. The requirements change because the users, rules and goals change. Human-centered design does not remove specificity; it makes specificity explicit.

The Athlete Is Not a Percentile

Anthropometry is the obvious starting point for physical equipment. Stature, limb length, shoulder breadth, hip breadth, reach and hand size can influence access to a control, alignment with a machine axis, foot contact, torso support and available clearance. But designing around an “average athlete” is rarely sufficient. The person near the middle of one body dimension may be near an extreme of another, and the relevant combination changes with the task.

The problem is also dynamic. A body dimension tells a designer where the hand might reach; it does not show how the athlete reaches it while holding a dumbbell, maintaining a setup, working around a spotter or breathing hard after a set. Strength, mobility, experience and fatigue can change how the same person uses the same hardware. Human-centered fit therefore includes physical accommodation, movement strategy and the conditions under which the equipment will be adjusted.

This is why “ergonomic” cannot be reduced to comfortable. Comfort is one response and may be useful, but it does not establish alignment, control, repeatability, error resistance or performance. A soft pad may feel comfortable and compress inconsistently. A broad handle may distribute pressure while forcing an awkward grip for smaller hands. A highly adjustable bench may accommodate more positions while increasing setup errors. The complete design has to be evaluated as used.

Equipment Is Part of the Exercise Prescription

Strength exercises are created by constraints. A barbell permits one set of movement solutions; independent dumbbells permit another. A Smith machine constrains the bar path. A cable establishes a line of resistance. A handle fixes grip orientation. A seat and pad establish where the body is supported. These constraints are neither inherently good nor inherently harmful. They define the task being trained.

Coaches already manipulate many of them deliberately. They change stance, grip, bar, range, tempo, resistance curve and stability demand to serve a programming objective. The equipment surface belongs in the same record. If a pad changes the athlete’s position, clearance, effective range or ability to reproduce the setup, the exercise condition has changed even when the load written on the program has not.

A null result is equally valuable when a design story sounds obvious. Goodman and colleagues compared a stable flat bench with an exercise ball in 13 participants. Under their protocol, the support change did not alter 1-RM strength, recorded upper-body and trunk EMG, or elbow range of motion (Goodman et al., 2008). The point is not that support conditions never matter. The point is that a plausible mechanism—such as expecting instability to recruit more stabilizers—cannot substitute for measurement.

This distinction protects both the athlete and the designer. It prevents a feature from being dismissed merely because it is unconventional, and it prevents that same feature from receiving claims its evidence has not earned.

Bench Research Shows Why the Interface Deserves Its Own Study

The bench press is an especially revealing case because the apparatus looks passive. The bar moves; the bench appears to stay out of the story. In practice, the bench fixes the surface beneath the head, thorax and pelvis, while the rack determines where the athlete must position relative to the bar. Width, height, compressibility, friction and support geometry establish boundaries around the torso before the first repetition begins.

Technique research shows that modest changes within those boundaries can alter the measured loading environment. In a second investigation, Mausehund and Krosshaug compared 12 powerlifters with 22 recreationally trained lifters during 6–8RM bench-press sets. Powerlifters used different bar paths and shorter joint ranges of motion; women and men also differed in normalized shoulder and elbow moment distribution and in the activity of selected muscles (Mausehund & Krosshaug, 2023). A design evaluated around one average technique and one average body can therefore miss meaningful ways that experienced athletes solve the task.

Together, these studies move the design conversation forward. They show that the visible exercise name is too coarse to describe the actual task and that athletes do not all interact with the same apparatus in the same way. They also set a demanding standard: if a designer believes a surface changes scapular position, force direction or joint loading, those variables should be measured directly rather than inferred from the surface’s appearance.

Match the Claim to the Evidence

Equipment development often collapses several questions into one. A product survives a load test, feels stable during a demonstration and is then described as improving mechanics, performance and safety. Each step may be reasonable to investigate. They are not the same endpoint.

ISO 20957-1:2024 supplies general safety requirements and test methods for stationary training equipment (International Organization for Standardization, 2024). Passing an applicable structural or stability requirement is foundational. It does not establish better shoulder mechanics. In the same way, a biomechanics study can show an immediate change without revealing whether athletes become stronger after eight weeks, and a strength trial can favor one condition without measuring pain or injury.

Competition standards illustrate the same distinction. The International Powerlifting Federation specifies a bench at least 1.22 m long, 29–32 cm wide and 42–45 cm high, among other requirements (International Powerlifting Federation, 2026). Those dimensions make the competitive task consistent and define what an athlete must practice on for specificity. They are not a biological claim that the regulated geometry optimizes every athlete, exercise or outcome outside competition.

AMM Case Study: Make the Interface the Experimental Variable

The athlete-to-bench surface had long been discussed through design rationale, coaching experience and adjacent shoulder research. AMM’s published program moved the question into direct comparison: hold the bench-press task and training framework as constant as practical, change the support condition and measure what follows.

Study 01 · Acute mechanics

Kidwell and colleagues used a randomized, single-blind crossover design in 10 resistance-trained men. Each participant performed five repetitions at 70% of the participant’s established 1-RM on a conventional flat bench and with The Launch Pad®. Bilateral pectoralis-major surface EMG and a linear position transducer captured activation, bar velocity, concentric power and vertical bar displacement (Kidwell et al., 2026).

The raw means were higher in the Launch Pad condition for right pectoralis activation (87.3% vs 70.2% MVC), left pectoralis activation (86.8% vs 68.3% MVC), mean velocity (0.47 vs 0.40 m/s), peak velocity (0.66 vs 0.57 m/s) and vertical bar displacement (44 vs 38 cm). Those values correspond to derived relative differences of approximately 24.4%, 27.1%, 17.5%, 15.8% and 15.8%, respectively. All activation and velocity comparisons were reported at p < .001; vertical bar displacement was p = .005. Concentric power averaged 271 versus 249 W—approximately 8.8% higher—but the corrected comparison was not statistically significant (p = .071; d = 0.23).

The immediate finding is substantive without being stretched: the tested interface changed several characteristics of a submaximal five-repetition set. The experiment did not measure hypertrophy, pain, injury or long-term adaptation. Its proposed explanations—thoracic position, scapular position and length–tension effects—remain mechanisms to test directly.

Study 02 · Four-week strength trial

Goldman and colleagues randomized 42 intermediate-trained men to the Launch Pad or conventional condition while both groups completed the same one-month, thrice-weekly bench program using a connected adaptive resistance machine to deliver supramaximal eccentric overload. All 42 participants completed the 12 supervised sessions (Goldman et al., 2025).

Mean 1-RM rose from 98.1 to 109.2 kg in the conventional group and from 97.4 to 115.8 kg in the Launch Pad group. The average gains were 11.1 kg (24.5 lb) and 18.4 kg (40.6 lb), an absolute between-group difference of 7.3 kg (16.1 lb). The Launch Pad group’s mean improvement was therefore approximately 66% greater; the paper reported p < .001 and Hedges’ g = 3.85. The effect size describes exceptionally large standardized separation in this sample. It is not a percentage and it does not mean the product was “3.85 times better.”

Study 03 · Eight-week collegiate football trial

Blatney and colleagues randomized 30 male collegiate football players to the two support conditions during an eight-week, two-block off-season program. The athletes completed three supervised sessions per week, for 24 sessions, while the researchers measured 1-RM bench press, repetitions on the NFL-225 test and seated medicine-ball throw distance (Blatney et al., 2026).

Both groups improved on all three outcomes. The Launch Pad group improved more: 1-RM increased 19.4 kg (42.8 lb) versus 9.7 kg (21.4 lb); NFL-225 performance increased seven versus four repetitions; and seated throw distance increased 2.7 versus 2.0 m (8.9 vs 6.6 ft). These were approximately 100%, 75% and 35% greater average changes, respectively. All three between-group comparisons were reported at p < .001, with Hedges’ g values of 3.99, 3.67 and 4.10.

This progression is more informative than an isolated product demonstration, but it is not one continuous causal experiment. The studies used separate samples and different protocols. No mediation analysis showed that greater activation, velocity or range caused the later performance differences. The collective conclusion is narrower and still important: the interface was a meaningful experimental variable across the tested conditions.

A Better Equipment Brief Starts With Seven Questions

Human-centered work becomes practical when it changes the order in which decisions are made. Instead of beginning with a feature and searching for a benefit, begin with a requirement and determine what would count as success.

What this changes in the weight room

• Coaches: record bench angle, rack height, seat position, grip and support condition when they materially change the exercise. Equipment settings are part of the prescription.
• Athletes: separate specificity from variety. The apparatus required in competition may be indispensable for practice even when another condition serves a supplemental objective.
• Facility owners: evaluate accommodation, transition time, lock confirmation, cleanability, maintenance and serviceability alongside rated capacity and price.
• Clinicians: treat equipment as one modifiable exposure among load, range, volume, symptoms, recovery and capacity. A feature is not a diagnosis or treatment.
• Designers: test usability before asking an athlete to load the system heavily. A geometry that cannot be configured reliably contaminates every later performance comparison.
• Researchers: report the exact bench, pad, upholstery, rack position, angles, settings and setup instructions. “Flat bench” is often not enough detail for replication.

What This Means for The Launch Pad® and Joint Ops™

The Launch Pad is AMM’s directly studied example of the framework. The product begins with a design premise about the athlete-to-bench interface, but its defensible claims come from measured outcomes: selected acute activation, velocity and range differences; a larger 1-RM change in a four-week eccentric-overload program; and larger changes in strength, strength endurance and seated throwing performance in an eight-week collegiate-football program. Those findings belong to the tested device, populations and protocols. They establish neither injury prevention nor clinical treatment.

Joint Ops extends that investigation from a removable athlete-to-bench interface to a complete bench platform. Selectable torso surfaces, shoulder-clearance intent, adjustable lumbar positioning, seat geometry, multiple back angles, repeatable indexing, stability and traction are design variables arising from the same human-centered brief. Unlike The Launch Pad®, Joint Ops does not yet have published outcome data. It should not, however, be described as unstudied: direct research has been underway for some time evaluating the working Joint Ops prototype—the prototype AMM publicly debuted at the CSCCa National Conference in May 2026.

Joint Ops is the next active experimental platform

The expanded question is: what happens when the athlete-to-bench interface is no longer treated as an accessory placed on a conventional bench, but as part of the architecture of the bench itself? The ongoing study represents active research into that question. Additional comparisons involving surface selection, shoulder clearance, lumbar and seat geometry, back angle, anthropometric accommodation, traction, setup reproducibility, force transfer and movement mechanics remain distinct questions whose evidence status depends on what is actually included in an active protocol.

Until findings are completed, approved for disclosure and published, the design rationale, adjacent literature and ongoing experimental program must remain separate from demonstrated Joint Ops outcomes. The fact that research is underway describes AMM’s development process; it does not establish a numerical result, statistical significance or superiority. The Launch Pad program can inform the Joint Ops hypotheses, but its findings cannot be transferred to the complete bench platform as direct evidence.

The surface belongs in the record

Strength training has become increasingly precise about what happens above the athlete: load, bar path, velocity, range, tempo and fatigue. Human-centered equipment asks for the same precision below and around the athlete. What is supporting the body? Where does that support end? Which settings define the position? Can another athlete reproduce it? Which measurement would show whether the difference mattered?

Once those questions are asked, the equipment stops being scenery. It becomes what it has always been: part of the training environment, part of the experimental condition and part of the explanation for the movement that actually occurred.