you won't know the exact number of calories, but I was asked to keep a record of everything I ate, drank and exercise on a daily basis for a year. it helped me to keep to a few "ground rules" such as no snacking between meals unless it was fruit, veg or salad and not to overdo the carbs. it...
concept rowers are the best but very expensive. treadmills are boring after a while (and I do a lot of running). I would go for the bike , but as an option, why not get a good mid range racing bike that you could go outside on in the spring and summer and buy an aero trainer to use it on in...