Participants will be randomized to public health or low dose exercise. Randomization will be stratified by baseline use/no use of prescription anti-depressants. Both low and public health exercise arms will receive supervised one on one instruction via video conference. The exercise will occur five times a week for 10 to 30 minutes each session. During the twelve week intervention, the exercise will increase in intensity and may include wrist and ankle weights. During each session, the participant will rate their perceived exertion using the Borg's Rating of Perceived Physical Exertion (RPE): a 10 Point Scale where 0 is no movement and 10 is maximum effort. Participants will also wear a heart rate monitor. Participants in the low dose exercise arm will be instructed to exercise at an RPE of less than 5 and a heart rate of less than 50% of their age-adjusted maximum (200 minus participant's age). The participants in the public health dose arm will be instructed to exercise at an RPE of between 5 and 7 and to maintain a heart rate of 55 to 70% of age-adjusted maximum heart rate.