The main objective of this study is to examine the relationship between self-efficacy of gym members and muscular endurance performance, measured from a push-up test. Data were collected from 70 male participants aged 18-25 years (M = 20.87, SD = 2.15). Prior to the push-up task, the participants were asked to rate the push-up self-efficacy scale, and they then performed the push-ups test using a "malan" detector. The participants were asked to do as many push-ups as possible in 1 min. Pearson correlation showed a positive significant relationship in that members who increased in self-efficacy also increased their push-up scores. This study concludes that the self-efficacy scale used for the specific exercise tasks (push-up) is a good instrument to assess a person's performance in an exercise program. The findings can inform gym trainers on effective means of providing motivational support for non-members of members who seldom visit the gym. Gym trainers can also benefit from the results in dealing with potential new members during free trial. The ability of gym trainers to influence new members in undertaking a comfortable and beneficial regime can increase the likelihood of members' adhering to the programme.