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Hartwig, Timothy Bryan, Sanders, Taren, Vasconcellos, Diego, Noetel, Michael, Parker, Philip D., Lubans, David Revalds, Andrade, Susana, Ávila-García, Manuel, Bartholomew, John, Belton, Sarahjane, Brooks, Naomi E., Bugge, Anna, Cavero-Redondo, Iván, Christiansen, Lares Breum, Cohen, Kristen, Coppinger, Tara, Dyrstad, Sindre, Errisuriz, Vanessa, Fairclough, Stuart, Gorely, Trish, Javier Huertas-Delgado, Francisco. BMJ Group; 2021. School-based interventions modestly increase physical activity and cardiorespiratory fitness but are least effective for youth who need them most: An individual participant pooled analysis of 20 controlled trials.