ENThe objective was to determine the contributions to changes in moderate-to-vigorous physical activity (MVPA) during the COVID-19 restrictions by age, gender, education, place of residence, type of work, type of sport, Body Mass Index (BMI), subjective health status, smoking, alcohol consumption, overeating, impulsivity, depression symptoms, stress level, sleep duration and emotional intelligence (EI). We interviewed 6369 people in Lithuania before the COVID-19 pandemic and 2392 during the COVID-19 restrictions, and they were 18–4 years old. The initial COVID-19 restrictions reduced MVPA. This decrease was greater in individuals with lower education levels, higher BMI, higher stress levels and higher self-rated health status. MVPA decreased among those whose self-rated health status was the poorest but increased among those whose self-rated health status was the best. MVPA decreased among young women, women whose work was mostly sedentary and smoking women, and it decreased among overeating men. The particularity of sport, alcohol consumption, sleep duration, EI, impulsivity and depression symptoms did not have a significant effect on changes in MVPA during the COVID-19 restrictions, among either gender or any age group. Keywords: COVID-19 pandemic lockdown; moderate-to-vigorous physical activity; body mass index; health status; sleep patterns; food and alcohol consumption; stress; impulsivity; age; gender. [From the publication]