*2.3. Four Square Step Test (FSST)*

The FSST is a way to measure dynamic balance, stability, and coordination [15]. It requires two sticks to be placed on the floor so that they form a "plus sign", and the participants must step in each square in a set sequence. There are two trials, and the best time is recorded [16].

#### *2.4. Procedure: Day 1*

Day 1 of the intervention consisted of anthropometric measurements, procedure familiarization, and strength tests. Participants completed an easy route with the top rope technique. Prior to the climb, they underwent a hand grip test with a Saehan Spring Hand® dynamometer (Saehan Corporation, Changwon 630-728, South Korea) and completed the FSST and the CSAI-2R.

During the climb, participants wore a Polar A300 watch and Polar H10 heart rate monitor (Polar Electro®, Kempele, Finland). They were instructed to climb at their normal pace. After the climb, they completed the hand grip test, the FSST, and the CSAI-2R again.

#### *2.5. Day 1 Strength Tests*

The participants finished day 1 with two strength tests: a maximum pull-up test and a bent-arm hang test. These tests were used to assess shoulder power and endurance, which has been shown to be the primary determinant for success in rock climbing [17]. The tests were included to provide objective measurements of participants' physical abilities. The pull-up test was performed with a pronated grip, and 1 repetition was considered as chin over the bar and full elbow extension. The bent-arm hang test was measured as the maximum time the participants could hang with elbows at 90◦ in the pronated grip position. Results are presented in Tables 1 and 2.
