i do anywhere between half hour and an hour on treadmill at brisk walking and with it sometimes on steep incline
i also do weights for toning of my arms, and occassionally do a work out dvd.
nothing too hardcore but i find i feel better for it and it makes me stick to CD as i dont want to undo all my hard work. i had a tip off a friend on here, that you should have your shake after you hav done your 'workout' as your metabolism will be boosted and having something to eat - be it a shake or a bar - will kick start it further