## 1 Introduction  
Physical fitness benefits related to high-intensity exertion and a sense of community have led CrossFit(r) to an unprecedented level of global popularity [1]. In fact, the CrossFit(r) program has quickly become one of the fastest-growing training concepts, boasting over 15,000 affiliated training centers and 5 million athletes worldwide [2]. CrossFit(r) workouts involve functional movements executed at high intensity, known as the workout of the day, typically including gymnastic exercises, metabolic conditioning, and Olympic weightlifting [2, 3]. These activities are executed in rapid succession, often prioritizing maximal numbers of repetitions within a specific period or completing a designated set of repetitions in the shortest time duration [4, 5]. Like other high-intensity resistive exercise modes, CrossFit(r) improves body composition, muscle strength and cardiorespiratory fitness [1]. To assess these changes in fitness levels and monitor work capacity, CrossFit(r) uses benchmark workouts, like Cindy [6, 7] and Fran [8, 9] that are among the most extensively studied [2]. The benchmark workouts are standardized, meaning athletes use the prescribed weight or height, complete the specified number of repetitions, and follow the exact movement patterns, to ensure performance comparability with athletes worldwide, regardless of location or environment [2; 9; 10]. However, mounting evidence indicates that certain CrossFit(r) workouts, paired with insufficient recovery periods, may heighten the risk of overload, fatigue and injury, especially in poorly trained individuals [1; 5]. The incidence of injuries in CrossFit(r) spans strength-related sports from 0.2-18.9/1000 h of participation, mirroring rates observed in other sports like weightlifting and powerlifting [11; 12]. In fact, the predetermined external loads and repetition volumes set for CrossFit(r) routines can exert a significant influence on the kinematics and kinetics of movements, with the imposition of significant loads on the knee, hip and shoulders amplifying the susceptibility to injuries [5; 12]. Potential contributor to CrossFit-related injuries, particularly shoulder injuries, is muscular fatigue from the high number of repetitions performed during sessions [13]. For example, the CrossFit(r) label workout requires completing 30 power snatch repetitions within a 2 min period (with a predominance of the anaerobic component), with a constant external load of 61 kg [4; 10]. This emphasis on anaerobic exertion, coupled with fatigue accumulation throughout the routine (due to the accumulation of hydrogen ions reducing pH and causing metabolic acidosis, as well as the inhibition of phosphofructokinase) [14], may compromise movement biomechanics, increasing injury risk for crossfitters [1; 5]. The relationship between fatigue and movements, especially prevalent in CrossFit(r) affluate technically demanding weightlifting exercises and heavy loads, necessitates attention [5; 12; 15]. The power snatch, by lifting the bar from the floor to a position above the head with the upper limbs fully extended in one continuous movement [16; 17], is a commonly incorporated exercise in strength and power training within CrossFit(r) programs [1; 4]. It stands out as the most technical component of weightlifting in CrossFit(r) competitions, demanding a precise mechanical execution [16; 17]. In weightlifting, success in the snatch is contingent upon the load lifted and is achieved through optimal force generation by maintaining specific positions during precise phases that align with an individual's optimal biomechanics [18]. Numerous kinetic and kinematic variables related to both the barbell have been documented to elucidate the snatch and its individual components, including power, velocity and barbell displacement [16; 19]. Previous studies indicate that as the load increases, the pull duration rises, while the maximal and mean velocities, as well as the power output, decrease [19; 20].