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One of the theoretical models that has been useful in understanding and predicting behaviour change is the Transtheoretical Model (TTM). The TTM includes a temporal dimension of change, in which behaviour change is described as a process that takes place over time with a sequence of the stages through which individuals progress toward an adoption of a regular behaviour. TTM was first focused on smoking cessation studies (Prochaska and DiClemente, 1982), but from the 1990s researchers started using the TTM in healthy lifestyle promotion, including physical activity, but mainly among adult populations (Bunton et al., 2010).

To study the process of adopting physical activity behaviour through the Stages of change (SoC) in children and adolescence, is of great importance due to their well-documented decline in physical activity levels (Aznar et al., 2011). The SoC in children and adolescents has shown a …