All the options listed are generally considered low-intensity cardiovascular activities. However, among these, bicycling can sometimes be performed at higher intensities depending on the speed and terrain.
So, while bicycling can be low-intensity if done leisurely, it is not always considered as such when compared to walking, hiking, or leisurely paced swimming, which are typically more consistently low-intensity.
If you have to choose one option that might not consistently fit as low-intensity, it would be bicycling.
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