This study is about finding out if walking more can help people who are overweight or obese improve their body weight and health. It's for adults aged 20 and older. Participants will use a **pedometer** (a device that counts steps) for **8 months**. The goal is to see if taking more steps can change body weight and reduce health risks like high cholesterol and blood sugar. **Key points:** - **Participation Duration:** 8 months, with step counts tracked. - **Visits:** Participants need to attend multiple lab sessions for assessments. - **Exclusions:** People with certain health conditions or who have recently changed their weight by 5% or more cannot join. The researchers hope to create a model to prescribe the right amount of walking to help people manage their weight and health better.