I would never do over 8 reps.. and if I was straining real hard on rep 6 or 7 I stop...... too much potential for a back injury.. you have to listen to your body..in the deadlift if you are straining and barely moving the weight up..something has to give...and it will be your back.. so let the weight fall..I never push to my limit on deads...........and my lower back feels great.........