new form of fitness desperately needed

hi guys – am new to this club – i found my way here due to the fact i have totally smashed my right lower leg – tib and fib – completely – so hence i am layed up in bed with no prospect of being able to put my foot to the ground and weight bear for the next 6 – 8 weeks – fattness here i come – i also need to lose some weight and had taken up walking – i was able to pump out 8-10k an hour before i fell on the deck – i thought the ice had cleared – but nope – so hence the smashed leg helicopter ride to the nearest hospital and all this done on morphine – not a fun place to be – but back to the origianl question – do any of you lovely people out there have any ideas of what i can do whilst beached like a whale and not allowed much movement