Frequency is how often you exercise or train. Although cardiorespiratory fitness improvements might be seen in deconditioned individuals with exercise two times per week, training fewer than two days per week does not generally show a mean tors ingful change in functional capacity. For most risk adults to achieve and maintain fitness benefits ACSM (2010) recommends moderate-intensity cardiovascular exercise at least five days a week, or vigorous-intensity training at least three days per week, or a weekly combination of three to five days a week blending moderate and vigorous activities.