The good news is research is showing the effectiveness of exercise on mental health. The bad news is, with all we know and understand about exercise, the dropout rate for novice exercisers remains high. The literature that has examined the mental health/exercise relationship has stated the need for further research into how physical activity should be prescribed to promote long term participation.
Until then, it is always a good idea to approach a new exercise regime with caution. Once we are approved by our health professional to start exercise, begin with two days a week and slowly (very slowly) work up to a maximum of five days. Be sure to consider exercise enjoyment, group support, and activities that will fit with our lifestyles (and bank accounts). Remember, an investment in time and consideration in the beginning will lead to a more successful relationship with exercise in the longer term.