Interruption of work in basic exercises occurs when the weakest muscles participating in the exercise reach muscle failure. In pulling exercises, this most often pertains to grip flexor muscles, i.e. muscles that ensure a firm grip. In order to avoid this, there are different methods and aids that can amplify it. One of them is the use of fitness wrist straps. Thus, this paper aims to establish whether and to which extent the use of fitness wrist straps in the performance of bodyweight pull-ups to failure can increase the number of repetitions in relation to the performance of pull-ups without the use of fitness wrist straps in one set. Physically active male population (n = 10) performed the maximum number of pull-ups with or without the use of fitness straps. The differences were established in a t-test for dependent samples and the increase and effect sizes were calculated. The t-test results point to a statistically significant difference (t = 4.64; p = 0.001) in results of the performance of pullups with (11.6 ± 3.95) and without the use of fitness straps (9.9 ± 4.12). The increase size reaches 17.17%, whereas the effect size is 0.41. The results obtained show that the increased number of repetitions performed with straps allows for an increase in the total work and muscle time under tension, which can be important for the development of muscle strength and hypertophy. Therefore, a dosed use of fitness straps in a safe way in line with precisely defined objectives of a training process is recommended.