School of Sport;
Exercise and Rehabilitation Sciences;
University of Birmingham;
Edgbaston;
Birmingham B15 2TT;
UK;
School of Clinical and Experimental Medicine;
University of Birmingham;
Edgbaston;
Birmingham B15 2TT;
UK;
Accelerometry; Exercise psychology; Moderate-to-vigorous physical activity; Motivation; Obesity; Self-determination theory; Youth sport;