Natural way to induce

Is there any ways to naturally induce/kickstart labor/contractions? As Gynae mention if baby by EDD not yet out will have to induce... I'm currently 38+1, not much time left till my EDD. Gynae have told me induce will take longer time up till 24 hours. I have heard people say walk more or try having sex. If walk, how long should the duration be? As for sex, when to start trying or try during week 39? Any other natural ways? Though I know it may not works for everyone...