Trampoline-Induced Changes in Pelvic Structure and Continence

The goal of this clinical trial is to evaluate whether a short bout of high-intensity trampoline jumping induces urinary leakage or measurable changes in pelvic floor morphology in active females aged 18-40 who do not report symptoms of urinary incontinence. The main questions it aims to answer are: Hypothesis 1: Does a single 10-minute trampoline protocol result in acute changes in pelvic floor structure, including bladder neck position, levator plate length, and/or posterior urethrovesical angle (PUVA)? Hypothesis 2: Do participants report any urinary leakage during the jumping protocol, despite being asymptomatic at baseline? Hypothesis 3: Do pelvic morphology changes recover within 30 minutes post-jumping, or do alterations persist? Researchers will perform within-subject comparisons at multiple time points (pre-jump, immediately post-jump, and 30 minutes post-jump) using transperineal ultrasound imaging to assess structural changes. Participants will: * Attend one laboratory visit * Complete baseline pelvic health questionnaires (ICIQ-UI Short Form and PFD Sentinel). * Undergo 2D transperineal ultrasound imaging in the standing position at rest, immediately post-jumping, and 30 minutes post-jumping. * Perform a 10-minute high-intensity jumping protocol on a mini-trampoline, while heart rate and perceived exertion are monitored. * Verbally report any urine leakage during jumping using standardized descriptors.