At last, the real secret to a strong and powerful core without doing sit ups...Listen up. This could be the most important message you'll hear if you want to get a strong, powerful and super lean core. If you're thinking six pack then we're on the same page. If you want to transform your torso, lose weight and build strength and power then you'll love what I've got next.First things first. I've got to get something off my chest and it's a bit controversial. Here goes...Traditional sit ups, crunches and Ab machines are out dated and not effective. If you want to develop a strong core, lose weight and develop a six pack they're a complete waste of time. To be brutally honest, sit ups (and all the hype and associated products that go with them) could be one of the biggest myths in fitness.Mel Siff, world renowned sports scientist and consultant has this to say about the plethora of Ab machines,