I have a question about the deadlift. As I push using my legs like a leg press from the starting position, I have my back as straight as possible, also tensed up as with my abs. Do I keep the back and abs tensed up throughout the whole rep, I find if I dont then my back starts to round out due to the weight pulling on my back?
Also, once the bar is above my knees, I am supposed to 'use my hips'. I don't know if I am doing that, I seem to be using my back to bring myself to an upright position. It reminds me of the back extensions you do on the hyperextension apparatus. Is that correct or not?