They won't even let you take a cab home from some hospitals. They want someone with you for a while after you get home in case of delayed complications.
Pre start of chemo, getting in as much exercise as possible to get your starting fitness as good as possible before they poison the shit out of you is a good idea, but once you start you will have trouble slowly walking to the end of the street, let alone ride a bike (YMMV as chemo covers a myriad of different treatments)
They won't even let you take a cab home from some hospitals. They want someone with you for a while after you get home in case of delayed complications. Pre start of chemo, getting in as much exercise as possible to get your starting fitness as good as possible before they poison the shit out of you is a good idea, but once you start you will have trouble slowly walking to the end of the street, let alone ride a bike (YMMV as chemo covers a myriad of different treatments)