i saw a nuero surgeon and was told i have severe spondylolisthesis. he told me no deadlifts and no squats,my question is what can i replace them with? what can give me mass in my back like deads? what can i replace squats with? the pain the last 3 weeks has been bad and i am taking a month off of lifting to heal up.I injured it deadlifting and the pains so bad i will never deadlift again.thanks for any help