Introduction:Squaresteppingexercises(SSE)havebeen introduced as an effective method for improving the balance of the elderly.We know that changing the strategies for maintaining balance and using less of the ankle strategy is one of the challenges of maintaining balance in elderly.According to the recent researches, the Gastrocnemiusmuscles act as the plantar flexor muscles of , one of the most effective muscles in the ankle balance strategy.With increasing age and inactivity, theamount of optimal muscle activity decreases. In the current research, we intend toinvestigate the effect of this type of exercise on the amount of electricalactivityofthe Gastrocnemiusmuscles.Therefore, thegeneral aim ofthepresent study is theeffect of eight weeks of SSE on the change oftheelectricalactivity of internal andexternal Gastrocnemiusmuscles.Methodology:This research is an RCT type, in which 30 elderly people were selected from the community according to the entry criteria and were divided into two groups of 15 people, SSE and control. In the pre-test measurement, the EMG of the internal and external biceps muscles was recorded with an electromyography device. megawin brand and according to Saniam's standard protocol, it was done in the walking task from one heel strike to the next heel strike. After processing the signals with MATLAB software and passing the signals through the low-pass filter, the root mean square(RMS)of them was extracted and the RMS obtained from the MVC of the web division muscle was calculated as a percentage. Then, the SSE group followed the daily activity for 8 weeks, 3 sessions per week and 60 to 70 minutes of training in each session, parallel to the control group.Stepping patterns in the exercise book are leveled and first the pattern chosen by the trainer was done on the ready mats, then the participants did it to master, then we asked them to raise their heels. 196 practice patterns have been designed, which we have advanced to the beginner level according to the research conditions. Then the post-test was conducted and the results were reviewed and evaluated.Results:The results of the research showed that performing eight weeks of SSE can significantly increase the amount of electrical activity (both p=0.001) of internal and external biceps muscles in the exercise group (n=14) with an average of 27.50 ± 2.71 after the test and 28.21 ± 2.75 compared to the control group (n=14) to increase the post-test mean of 23.42 ± 2.92 and 25.07 ± 3.98.Conclusion: The research results are consistent with Han 2017 and 2016 regarding the effect of WBV endurance exercises and Park 2015 regarding the effect of combined exercises on the EMG change of the Gastrocnemiusmuscles. Therefore, it can be said that square stepping exercises increase the optimal use of these muscles by increasing the electricalactivityof theGastrocnemiusmusclesandcan facilitate the use of theanklebalancestrategy intheelderly.