TY - JOUR AU - Powell, K E; Paluch, A E; Blair, S N TI - Physical activity for health: What kind? How much? How intense? On top of what? JO - Annu Rev Public Health VL - 32 PY - 2011 DO - 10.1146/annurev-publhealth-031210-101151 SP - 349 EP - 365 ER -