way up at the top of this post, the straight-legged deadlift is described as "bend from the waist" - this terminology could be misinterpreted. One does not bend from the waist - this would round the back. One bends at the hips keeping the back relatively straight. Think "Ken Doll". To get the feeling right - without the bar, put your thumbs where your upper thigh meets your hips and bend forward - you should feel yourself bending around your thumbs. Contrast this to putting your hands on your waist and bending over.
Just a nit.