The current research includes the impact of Pilates reformer exercises on the body awareness and perceived pressure of athletes in dim and bright environments. The concept of body awareness is a key approach that includes awareness of how to use the body, from the perspective of body behavior, body function and interaction with oneself and others. The aim of the present study was to investigate the effect of Pilates reformer exercises on the body awareness and perceived pressure of athletes in dim and bright environments. The research method was semi-experimental and pretest-post-test design with two experimental groups and one control group. The statistical population of the research includes all the athletes of Tehran province who have the condition to enter the research. The selection of the statistical sample of athletes was available, the statistical sample of athletes was in Masa Studio, Reformer Pilates Studio managed by Safura Tahmasabi. A total of 75 athletes from Tehran province were randomly selected in two pre-test and post-test designs with two experimental groups and one control group (in 2 low-light and high-light experimental environments). To collect data, Shidels et al. 's body awareness questionnaire (1989) and Borg's perceived pressure or difficulty scale questionnaire were used. After selecting the subjects, they were randomly divided into two control and experimental groups. All subjects were pre-tested in the form of filling in a physical awareness questionnaire, and then a training program was conducted on the experimental group in two low-light and bright-light sports venues for 2 months, during which the control group did not receive any training. After the end of the training period, the subjects of both groups were given a post-test. The experimental group had three training sessions per week and continued training regularly for 8 weeks. The duration of each training session was 60 minutes. For the educational program in a bright environment, from the number of 8 LED lights whose wattage range was from 100 to 500 watts. We used and we can use 4 LED lights for the training program in low light environment. . The duration of each training session was 45 minutes by the Reformer Pilates trainer. Descriptive statistics (such as mean, standard deviation, minimum and maximum score) and inferential statistics were used for data analysis. In order to check the normality of the data, Shapirovik's test and Levin's test for equality of variances and covariance analysis as well as one-way analysis of variance (ANOVA) with SPSS version 23 software at a significance level of ≥0. 05 P were used to compare groups. Also, a significance level of =0. 05 has been considered for all hypotheses. . The results showed that: Reformer Pilates exercises predict physical changes (P ≥ 0. 05), predict physical reactions (P ≥0. 05), sleep and wake cycle (P ≥ 0. 05), disease onset (P ≥ 0. 05) and stress Perceived has a significant effect in dim and bright environment. As a result, it can be said that Reformer Pilates exercises had a significant effect on the physical awareness and perceived pressure of athletes in dim and bright environments.