**Study Summary:** This study is looking into how people feel and what they think after receiving two types of chiropractic adjustments: one real, called *high velocity, low amplitude (HVLA)*, and one fake, known as a *simulated or sham* adjustment. A chiropractic adjustment is when a chiropractor uses their hands or a small tool to apply a controlled, quick force to a spinal joint. This study wants to see if people can tell which type of treatment they received without being told. It also checks how these treatments affect heart and movement measurements. Participants will wear special sensors for *electrocardiography (ECG)*, which measures heart activity, and *impedance cardiography (ICG)*, which looks at the heart’s pumping action. The study also uses sensors to check how people walk on a treadmill. **Key Points:** - The study involves two treatment sessions with a one-week break in between. - Participants will fill out surveys about their treatment experiences. - Special sensors will be used before and after sessions to measure heart and walking changes. Participants must meet specific health criteria to join.