Despite this evidence, it is unknown if acute (single) bouts of exercise can provide benefits in varying cognitive domains. Previous research has shown that acute bouts of aerobic physical activity, of both light and moderate intensity, decrease state anxiety in breast cancer survivors. However, it is not known if these benefits extend to cognitive functioning. Furthermore, most of these results are founded in cross-sectional research and it is unclear whether acute bouts of physical activity improve cognition and, if they do, how long this effect lasts. This has implications for real world contexts in that, if benefits are present, breast cancer survivors can find relief in cognitive symptoms quickly by simply engaging in a bout of physical activity. This study will be the first, to the investigators' knowledge, to examine the effects of an acute bout of aerobic exercise on cognitive functioning in breast cancer survivors.