Brief Structured Team Reflection Embedded in Elite Underwater Rugby Training (BSTR-UWR)

This single-arm field evaluation examined whether a brief, structured team reflection routine embedded within usual elite underwater rugby training was associated with change in team cohesion, psychological safety, peer trust, and team identification across three measurement occasions. Twenty-five male athletes contributed at least one assessment. Baseline responses were recorded on 16-17 February 2026 (T0), midpoint responses after session 6 on 5-9 March 2026 (T1), and endpoint responses after session 12 on 18 March 2026 (T2). The registered plan anticipated 16 sessions over six weeks; operational delivery concluded after 12 sessions, and no later follow-up was conducted.

Inclusion Criteria: * Male elite underwater rugby athletes aged 18 years or older. * Officially rostered in the squad and training regularly (minimum 2 sessions per week). * Able to complete Spanish-language questionnaires. * Willing to participate and provide written informed consent. * Available to complete assessments at baseline (T0), week 3 (T1), and week 6 (T2). Exclusion Criteria: * Unable to complete the questionnaires reliably (e.g., language/comprehension barriers). * Anticipated prolonged absence during the 6-week period that would prevent meaningful exposure to the intervention and/or completion of follow-up assessments. * Declines participation or does not provide informed consent.