I have hills in my neighborhood for when the weather is clement, and a mini-trampoline (3ft circle) and a sort of pumping/cycle thing for bad weather....I don't have a rigid schedule for them, but I need to increase the time I spend on them, as my 'work' involves getting tired without any real aerobic exercise. (standing up at a lathe, straining back & legs)...

Using the machines or walking between sessions in the shop can really reduce my pain.