The results of the HIIT Literature Review found research results that deserve to be studied as table 1 as follows.
The research above has similarities, using high intensity, a minimum of eight types, training frequency at least 3 times per week. In contrast, there are generally differences in training intervals,
types of HIIT training and research objectives. to improve sports performance. Therefore, HIIT still needs to be developed to improve the performance of each type of sport.
The results of the Literature Review on Increasing Reactive Agility were found to be worthy of study, as shown in Table 2 as follows.
Table 2 states that the relevant research used in this study has differences in research methods that focus on experiments while the current research uses the literature review method. The similarity of this research with relevant research is to make reactive agility the main topic that will be discussed in the study. There is a lack of information about reactive agility in one sport, so researchers want to research reactive agility specifically for tennis, which can later be used as a reference source for further researchers.
Based on the literature review, researchers developed HIIT for reactive agility in tennis. The HIIT program for reactive agility is, as shown in Table 3 as follows:
Y Dynamic Run
A form of exercise in which the athlete runs through the ladder after listening to the signal, then sees the flag sign from the coach to run towards the raised flag immediately.
Reactive Ledder Ball
An exercise where the athlete stands in front of the coach with 3m distance(ball thrower), the coach throws the ball to the throw, and the athlete stands in the middle between the ladder by 3m
distance, the athlete is directed to catch the ball, quickly. After catching, the athlete is required to move following the direction of the ball and perform back and forth movement through the ladder
Zig-Zag Run and Reactive Ball
Zigzag running with 1-meter distance where each cone is 7 meters long. And it ends with the athlete running on the spot to get ready to catch the tennis ball as fast as possible and return to the previous endpoint. Chasing the ball is carried out 3 times.
Run and Reactive Step
An exercise that the athlete must touch the cone immediately and then return as soon as possible to the starting box where the athlete started the movement. In the starting box, the athlete performs a ready-to-move position by running in place.
Reactive Agility Shadow
Reactive Agility shadows is an exercise that relies on shadows while the athlete is at a point in the middle holding a tennis racket and preparing to listen to the coach's signal. The athlete runs at the point of the cone, then performs 1 basic movement in hitting the ball and returns to the starting point.
T Dynamic Run
This exercise is almost the same as the Y Dynamic Run exercise. The difference is that the athlete advances by opening the lid and jumping forward after passing the ladder after listening to the signal, then seeing the flag sign from the coach to take a quick step towards the raised flag immediately.
Expert Test Results
8 experts analyzed the results of the expert assessment with the Aiken formula. as shown in Table 4 as follows
Based on table 4 in point 1, namely the type of activity according to the concept of reactive agility, the Aiken value of 0.875 is categorized as having high expert agreement; in item 2, namely the frequency of training following the idea of training, Aiken's value of 0.875 is categorized as an expert who has very high agreement; and in point 3, namely rest between activities by the concept of training, the Aiken value of 0.917 is categorized as an expert who has very high agreement; while in item 4, namely rest between sets according to the concept of physiology, Aiken's value is 0.917 with expert categorization as having very high agreement.