We are looking for couples 45-75 years old who are living together to participate in the research study "Physical activity promotion through wearable monitors." Participants will receive a Fitbit activity tracker (worn like a watch) to use for 3 months. Participants will also complete an online questionnaire and wear an accelerometer (worn like a belt) 3 times, and come to our lab twice to perform a walking treadmill test. You must have a smartphone or tablet with bluetooth technology to participate and one or both partners must be getting less than 2.5 hours of exercise per week. If you are interested or have any questions, please contact the lab privately at 250-472-5288 or email bml@uvic.ca.