I admit to being an exercise novice. I'm currently looking at a workout bench. I originally was looking for a flat to incline bench but then I saw benches offering a decline option too. Like this one: http://www.dynamicfitness.com/detail.aspx?ID=840&name=Bodycraft F602 FID Bench I know what to use incline for but what exercises can you do in the decline position? Is it sit ups? Is a bench with a decline option worth the extra cash? Thanks.