I am 4 weeks post op. Have been walking and doing the elliptical at no resistance. When I ask my Doctor's office what other types of exercise I can do the only answer I get is "4-6 weeks" for exercise. It's been 4 weeks. I want a straight answer on what and when. I've seen people in the forums jogging at 2 weeks and others say no core work for 8 weeks. What was your dr's advice?