my teacher says alot of excersise is the key such as joggin
I agree with Clysta. Baby will come when it wants to and there isn't anything you can do to speed that up. I was 3 cm 80% effaced for weeks before I had my daughter. I was even told I probably wouldn't make it to 36 weeks. When I reached 37 weeks I tried EVERYTHING to get her to come out but she didn't come until 39 weeks.
Honestly, just keep walking the best you can and keep up with what you're doing BUT, keep in mind nothing will work until baby is ready and you won't be able to force them out. As much as you're ready for baby to be born pregnancy is dated to 40 weeks for a reason.