Gamification Effects on the 6-Minute Walk Test in Children

Inclusion Criteria:

* Clinical diagnosis of, or active evaluation for, a neuromuscular disorder
* Able to ambulate (with or without usual orthoses/assistive device) sufficiently to attempt a 6-minute walk.
* Note: Acceptable if the patient needs to take breaks or sit during the test. Those unable to finish are counted as protocol deviations, not exclusions.
* Medically stable on the test day (no acute illness or recent surgery that would contraindicate moderate exercise).
* Child able to understand simple instructions in English and provide assent (if applicable based upon age and developmental level); parent/guardian able to provide consent in English.

Exclusion Criteria:

* Non-ambulatory or unsafe to attempt walking as judged by the treating physician.
* Severe cognitive/behavioral impairment that precludes following instructions.
* Acute cardiopulmonary, orthopedic, or other medical condition that makes walking unsafe on the test day.
* Non-English-speaking family (materials are available only in English for this pilot).
* Any child/parent who declines consent/assent or withdraws at any time.