A higher effort-based paradigm in physical activity and exercise for public health: making the case for a greater emphasis on resistance training by Steele, J, Fisher, J, Skivington, M, Dunn, C, Arnold, J, Tew, G, Batterham, A, Nunan, D, O'Driscoll, J, Mann, S, Beedie, C, Jobson, S, Smith, D, Vigotsky, A, Phillips, S, Estabrooks, P, Winett, R