The purpose of this research was to study the effects of different intensities of warm up on the balance of indoor climbers. In order to do this, a series of careful designed experiment were carried out. 13 healthy male rock climbers (age 24.46±4.7 yrs) with Difficulty Grade 5.11b – 5.12d on the Yosemite scale. Protocols of 20 minutes warm up were included: 1. running on treadmill in 10 minutes 2. Stretching (general and specific) in 5 minutes. 3. Warm up on easy routes on climbing wall .The subject completed 4 intensity of warm up in 50%-60%-70%, 80% vo₂max base on the table of American college of sport medicine. The Biodex Balance System was used to implement dynamic test in Athletic single leg test. Overall (OSI), anteroposterior (API), mediolateral (MLI) stability indices was measured in each day that this System was adjusted on level 3 of platform in 10 seconds. Further analysis includes Repeated Measure. The result indicated that there was significant difference (p<0.05) in right foot API and in left foot in OSI & MLI. But there was no significant difference in right foot in MLI & OSI, and in left foot in API. The decreasing trend of OSI score indicate improvement in balance score, so the line chart also indicate improvement in balance score of subjects during 4 days .These results refer to motor patterns of rock climbing and also refer to effect of the different intensities of warm up on weak muscles that can be shown there is imbalanced strength muscles of feet because the lack of standard program of training

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