Background: Impaired balance and decreased muscle strength is a problem in the elderly. The disorder is due to a decrease in physical health. Non-pharmacological actions taken to improve balance and muscle strength are quadriceps isometric exercises. Repeated movements in the quadriceps muscle will increase the work of the muscles around the joints, thereby launching blood flow. And stimulating muscle contraction can then improve the balance and strength of muscles in the elderly. Purpose: to analyze the balance and increase in muscle strength before and after quadriceps isometric exercise in the elderly. Method: this research method is a quasi experiment pretestposttest with control group design. The population of this research is 34 elderly aged> 60 respondents and divided into two groups, namely the treatment group and the control group. The treatment group respondents were given quadriceps isometric exercises twice a week for five weeks and the control group was not given any treatment and continued to carry out daily activities as usual. Pre and post tests were conducted on both groups to find out the increase in balance and muscle strength. Data analysis using the Wilcoxon Signed Rank Test, and Mann Whitney at a significance level ρ value <0.05. Results: the treatment group obtained an increase in balance of 2.76 and muscle strength of 4.47. Wilcoxon Signed Rank Test, and Mann Whitney Test, the value of ρ value <0.05 means there is a difference in the increase in balance and muscle strength in the treatment group, whereas in the control group there is no significant difference with the value of ρ value> 0.05 Conclusion: there was a significant difference in the improvement of balance and muscle strength in the treatment and control groups after being given a quadriceps isometric exercise.