Getting a strong core won't happen with hundreds of crunches. In fact, you should stop doing crunches because they aren't good for your back. If you want a strong core, you've got to focus on core stability
(CNN) — It's one of the holy grails of science: a cure for Alzheimer's. Currently, there is no treatment to stop the disease, let alone slow its progression. And billionaire Bill Gates thinks he will that.