I'm wondering if someone in the know could advise me on how often to use the cross trainer and for how long at a time? I also have some weights and I've no idea what to do with those! As you can probably guess, I'm a failed exerciser. Gave up c25k (tho want to try again), gave up swimming. I really want to get fitter and lose 12 kilos. Would using this regularly make a difference? please say yes