Hi Corta,
I echo what has been shared that you should listen to your body and engage a competent PT professional. I am now 7 weeks post-op/posterior approach. What I have found is that the things I was strong in pre-op I am rapidly regaining post op and where I was deficient (flexibility) I am still challenged. My guess is, as stated above, that you experiment by starting slowly and then increase as your body allows.