Digital Intervention for the Modification of Lifestyles (iGame)

IInclusion Criteria for Breast Cancer Survivors subgroup: * Men and women * Age between 18 and 65 years * Sedentary behavior recognized by the subject: \<1.5 METS per day and sitting\> 4h / d . * Intention to change sedentary behavior manifested by the subject * Survivors of breast cancer. Women with a clinical history of diagnosis of primary breast cancer, having completed surgical treatment, radiotherapy or chemotherapy at least three months before starting the study intervention Inclusion Criteria for Low Back Pain subgroup: * Men and women * Age between 18 and 65 years * Sedentary behavior recognized by the subject: \<1.5 METS per day and sitting\> 4h / d . * Intention to change sedentary behavior manifested by the subject * Mild low back pain of mechanical or degenerative cause diagnosed by a primary care physician Inclusion Criteria for Depression subgroup: * Men and women * Age between 18 and 65 years * Sedentary behavior recognized by the subject: \<1.5 METS per day and sitting\> 4h / d . * Intention to change sedentary behavior manifested by the subject * Mild depression Diagnosis in Primary Care using the MINI interview to rule out another severe mental pathology and the PHQ-9 questionnaire to categorize the level of depressive severity Exclusion Criteria: * Several mental illness * Several illness that limits physical ability * Phobia for digital technologies * Difficulty in attending study measurements