Primary outcome measurement: physical activity
Our primary outcome is minutes of moderate intensity daily physical activity. Participants will wear an ActiGraph GT3X+ accelerometer-based device on their hip and the device will be initialized to collect raw data at 30 Hz. The participant will be instructed to wear the device during waking hours every day for 7 days, except during water activities. At minimum, the GT3X+ must be worn for 10 waking hours/d on at least 4 days. Initially, the raw GT3X+ data will be used to estimate time spent in MVPA (physical activity at ≥ 3.0 metabolic equivalents units) using publicly available algorithms developed for adults [