This preliminary study aimed to investigate the contribution of the Theory of Planned Behavior to the prediction of attitudes and intention of adult involvement with physical activity during the Pandemic. The sample consisted of 904 individuals, 417 men, and 487 women, aged 18-70 years. Participants completed the Greek version of the “Theory of Planned Behavior” questionnaire. The analyses revealed differences between previous and during COVID-19 physical involvement in (a) attitudes, (b) intention, (c) attitude strength, (d) self-identity, and (e) subjective norms, of the sample.