## 3 The Role of Sensory Processing and Motor Skill Performance in Reactive Agility  
In 2002, [PERSON] et al. [28] suggested a model determining the main factors of agility. It consists of two main components, i.e., perceptual and decision-making factors and change of decision speed. The first component includes visual scanning (ability to process visual information in competitive games), anticipation (prediction of an event in a game that influences the movements of a player in a game), pattern recognition (the ability to reorganize patterns of play by an opposing team or player), and knowledge of situations (knowledge of the probable movements of other players, based on previous experience of the game). The second component includes technique (foot placement, adjustment of strides to accelerate and decelerate, body lean and posture), straight sprinting speed, and leg muscle qualities (strength, power, and reactive strength). Later on, this model has been modified by [PERSON] et al. [29], as follows. A model of agility in invasion sports consists of three components, which are cognitive, physical, and technical. The first component includes decision making speed and accuracy (visual scanning, anticipation, pattern recognition, and knowledge of situations). The second component includes leg muscle qualities (strength, power, and reactive strength), core strength, and straight speed. The third component includes feet placement, adjustment of steps to accelerate, body lean and posture. For example, a significant correlation between the time in the Y-shaped agility test and the 20 m sprint time, the 505 Agility test time, and RSI was found, whilst there was no relationship with parameters pertaining to reaction speed in handball players [30]. However, Reactive Agility Test (RAT) performance was not associated with RSI, the 505 Agility test time, squat jump height, 20 m sprint time, and reaction time to fast generated visual stimuli in spite of a seemingly large effect. It appears that the contribution of sensory and motor components depends on the structure of the agility test. While the Y-shaped agility test is mainly determined by the linear sprint speed, the change of direction speed, and reactive strength, there is a tendency for RAT to be determined by reactive strength, change of direction speed, explosive strength, and visual reaction time. This indicates that running speed and muscle strength are critical factors of agility performance in handball players. However, perceptual and decision-making processes play an important role in reactive agility. Therefore, more attention should also be paid to the improvement of cognitive skills in handball players. Exercises involving running with changes of direction in reaction to visual stimuli rather than pre-planned change-of-direction (COD) movements should be included in their training programs. In this regard, [PERSON] et al. [31] reported that COD ability is an example of an isolated component of agility in which movement and perception are decoupled, and therefore, COD tests can lack ecological validity. The movement techniques and strength qualities that are important in many COD movements do not necessarily apply to agility in invasion sports [31]. The authors encourage researchers to study agility in a more naturalistic setting that can be expected to transfer to on-field performance. A recent scoping review revealed that the change-of-direction speed (CODs) is associated with sprint time for 10 m, 20 m, and 30 m but not for a shorter distance of 5 m [32]. The CODS also correlates with maximal leg strength, both explosive and reactive [32]. However, the strength of this relationship depends on the type of CODS test, its structure (total running distance, number of changes in direction), and parameters analyzed (peak and mean values of power, velocity, and so forth) [32].