as said, walk, run, jog, swim what ever but some sort of exercise. i find i am quite happy doing situps, press ups chin ups etc but most people may find this boring?
as for turbo, i haven't got one but would love one if i had somewhere to set it up semi permanently for this time of year and you can just hop on a go for how ever long you have, be it getting up earlier and spinning for 30 mins or just a quick go before bed or so. only needs to be 10 or 20 mins which most people can find time for somewhere
i find getting up earlier keeps me on it believe it or not, i usually get up at 07:00 7 days a week being a lazy bum but i love to get up at 04:00 or earlier. will be doing this at least 5 days a week coming next september round abouts
Cheers Ed