Purpose: To analyse changes in PA habits during COVID-19 confinement in a sample of Spanish breast cancer survivors and whether these changes have led to differences in current physical activity practice.Methods: This is a descriptive study using an ad hoc survey. Sociodemographic, clinical and physical activity variables were recorded in a sample of breast cancer survivors over 18 years old, independently of treatment and diagnosed stage. Final sample was 124 women, most of whom had completed the treatments.Results: There was a significant decrease in physical activity level of Spanish breast cancer survivors during confinement. However, there were no significance comparing pre and post confinement periods. In all periods those women who trained under supervision had a higher level of physical activity. Comparing pre and post periods, more survivors performing their training outdoors after confinement. Before confinement, training location influenced survivors who trained in sport centres did so at a higher intensity and for longer periods. After confinement, the training location only influenced the duration of training. Conclusion: During COVID-19 confinement there was significative changes in the physical activity habits of Spanish breast cancer survivors. However, the only change from before the confinement was the location.