## 1 Introduction  
In the realm of workplace health prevention, the integration of ergonomic principles has emerged as a pivotal area of focus, marked by an increasing reliance on advanced technical tools, such as inertial motion analysis systems. The evolution of ergonomics research, driven by the imperative to enhance workers' safety and well-being, has introduced sophisticated methodologies for capturing kinematic, kinetic, and electromyographic data [1]. These advancements facilitate a comprehensive understanding of workers' performance, with a particular emphasis on motion and posture analysis as foundational tools for the diagnosis, treatment, and prevention of musculoskeletal disorders (MSDs) [2; 3; 4; 5; 6]. Notably, assessing human motion during functional activities stands at the forefront of efforts to promote health and prevent workplace injuries, underscoring the critical importance of accurate ergonomic evaluations. Recent advancements underscore the importance of assessing movement ergonomics, propelled by technological innovations, such as inertial systems for human motion analysis. This research trajectory highlights a gap in traditional workplace ergonomic assessments, often neglecting the implications of movement asymmetry [7]. Despite the expectation for symmetrical limb movements to minimise energy expenditure during routine activities, the reality of workplace tasks, particularly in settings characterised by repetitive motions, such as assembly lines or machining operations, frequently deviates from this ideal [8]. This discrepancy not only elevates the risk of energy inefficiency but also predisposes workers to a spectrum of orthopaedic and neurological complications arising from prolonged asymmetric limb movements. In light of the European standards presenting guidance to the designer of machinery or its component parts [9], the concept of repetitiveness in occupational tasks is often characterised by the continuous replication of identical cycles, technical actions, and movements throughout a substantial portion of a conventional workday. Particularly perilous are those repetitive movements that incessantly engage the same joints and muscle groups, compounded by the frequency, velocity, and duration of such activities [10; 11]. The analysis of task repetitiveness necessitates an examination of the steps or cycles involved. The inherent danger of work characterised by repetitive movements is augmented by the limited opportunity for workers to fully recuperate in the brief intervals between these actions, leading to a heightened risk of injury should the activity persist in the face of mounting fatigue [11]. Repetitive motions, intrinsic to uniform work activities, pose significant risks, particularly when combined with awkward postures and forceful exertions. These risks are further amplified in tasks involving asymmetrical movements--a hallmark of production or assembly line work where one hand stabilises an object. At the same time, the other performs rapid actions, such as connecting or integrating components. The frequent repetition of such motions, occurring every few seconds over extended periods, like an eight-hour shift, leads to cumulative fatigue and muscle strain, ultimately resulting in injuries or musculoskeletal disorders (MSDs) [12; 13; 14]. Globally, MSDs constitute a significant health predicament with profound socio-economic repercussions. They afflict approximately a third of the global populace, emerging as a predominant cause of chronic disability, absence due to illness, diminished work productivity, and quality of life [15; 16]. It is significant to underscore that the incidence of these disorders within certain working demographics and/or occupational sectors markedly surpasses that in the general populace [17]. In this discourse, they are delineated as work-related musculoskeletal disorders (WMSDs), the most prevalent work-associated health complication within the European Union, affecting workers across all sectors and vocations [18].