In this context, performance--the ability to achieve a result using minimal time and resources--can be predicted by self-efficacy, as demonstrated in previous studies [30; 31]. [PERSON] (1995) defined self-efficacy as the perceived ability to cope with situations involving cognitive processes and beliefs about one's abilities. Thus, along with the practice of brief mindfulness, significant changes occur in attentional ability and higher-order cognitive processes or executive functioning [32; 33], which improve individuals' capacity for adaptation and performance [17; 23; 34]. Furthermore, brief mindfulness has been shown to reduce stress [22; 35], fatigue, and anxiety [32; 33], while also increasing intrinsic motivation [36], attention and self-regulation [37], attenuating sunk-cost bias [38] and decreasing negative mood, rumination [39; 40], and mind-wandering [41]. Capacity for adaptation, preparation, and better performance is related to arousal, through the activation of the autonomic nervous system [34; 42]. Regarding sympathetic system activity, limited research has explored the relationship between mindfulness practice and electrodermal activity (EDA). Facing novel, relevant, or important situations generates an activation response, leading to increased EDA [43]. However, evidence on the effects of mindfulness on EDA is mixed: while [PERSON] et al. (2007) reported that a 7-week mindfulness program led to reductions in participants' baseline EDA from the onset of the program, [PERSON] and [PERSON] (2010) observed no significant changes. Additional studies support reductions in EDA during mindfulness exercises, lower baseline EDA following MBSR training, and decreased EDA responsiveness to aversive stimuli [43; 44]. While participants initially showed a significant reduction at the beginning of relaxation conditions, a marked increase in EDA was observed after completing both mindfulness and relaxation interventions [45]. Regarding Heart Rate Variability (HRV), which reflects parasympathetic activity and self-regulation, several studies have linked mindfulness practice to positive outcomes. [PERSON] (1985) observed reductions in heart rate (HR) following MBSR training, although [PERSON] and [PERSON] (2010) did not observe significant changes. Conversely, some studies have reported increased HRV in participants practicing mindfulness meditation [46], engaging in mindful breathing exercises [47], or performing coherent breathing as compared to spontaneous breathing [22]. These findings suggest that mindfulness practices, especially those incorporating controlled breathing, may enhance autonomic flexibility and strengthen self-regulatory capacity. Therefore, brief mindfulness practice appears to influence various cognitive capacities, as well as both emotional and physiological responses, which may ultimately enhance performance. However, evidence supporting the beneficial effects of brief mindfulness practice remains limited. Consequently, this study aims to investigate the impact of a brief 10-min mindfulness session on performance, self-efficacy, task appraisal, EDA, and cardiovascular measures, during a cognitive task (the Tower of Hanoi\(-\)ToH) that requires complex reasoning, learning, and attention, while encouraging participants to surpass themselves within a context of self-competition. The study seeks to provide new insights into how short mindfulness practices can enhance performance and encourage self-improvement in the context of self-competition. We hypothesize that participants receiving a brief mindfulness intervention will demonstrate enhanced performance in the subsequent task compared to the control group [14; 34; 38]. Additionally, we expect that the mindfulness group will report higher self-efficacy prior to the task and experience less perceived stress and difficulty post-task [29].