I would spend as little as possible on exercise machine my wife has bought several over the years and they have all gathered dust after a few goes on them .The one machine I can recommend is an AB cruncher it looks like a bit set of handlebars and you lie on the floor under it and do sit ups. It does actually work and improove your stomach muscles and gives less strain to your stomach and back muscles and as you can buy them for under �20 it is cheap enough if you run out willpower and stop using it.If you do want something more technical look in the bargain section of your local paper and you'll see loads of stuff thats hardly been used.