form on the negative phase of a low back extension ADVERTISEMENT 559 viewsAugust 11, 2012 0 Angela August 11, 2012 0 Comments eccentric phase of a lower back extension, how far to bend forward 3 Answers ActiveVotedNewestOldest 0 Joanne0 Posted 0 Comments I wish I knew what muscles you are targeting. Your question is a bit ambiguous and thus, it’s a bit difficult to respond to it. Would you give us more detail. Thanks. You are viewing 1 out of 3 answers, click here to view all answers. Register or Login