Sampling method
A simple randomization method was used to select the subjects in the intervention and control groups. To this end, first, the names of the older were written on separate sheets, and then they were placed in an envelope. The participants were randomly placed in the intervention and control groups by taking them out of it one by one. At baseline, the researcher completed the questionnaires by asking questions about the samples. After training corrective exercises, the musculoskeletal status of the samples was checked again by the researcher. The pre-test was performed one week before and the post-test one week after the 8-week intervention (corrective exercise).The sample size was calculated by considering the test power of 0.9 and the significance level of 0.05, 26 people for each group based on the following formula. Taking into account the probability of attrition, the final sample size of 35 people for each group was considered.
