The problem with biking is that people tend to exert themselves unlike walking which tends to be more leisurely done. The solution could be an electric shopping

The problem with biking is that people tend to exert themselves unlike walking which tends to be more leisurely done. The solution could be an electric shopping bike, the type they use in Japan or Holland and such places. Very comfy seat, upright sitting and much more relaxed ride overall. Another option is rowing which is much less strenuous on the knees, either outside or with a machine at home.