Interesting exercise comments.
I guess, to me, it's about doing as much as you can (safely obv) to give yourself the best odds- fitness, breathing exercises, knowing about various pain relief choices, psychological preparation (by that i mean trying to go in relaxed, calm, feeling as prepared as possible even if that is just having packed a hospital bag!).
Then be ready for 'what will be will be'. I was fit, not overweight, reasonably young (30) and did loads of antenatal and preg yoga before DS. Did all the active stuff, different positions, birthing ball, walking about, pool etc. but it ended in EMCS.
Same tactics this time I think. Just with an extra scan at 35 weeks to check baby's size, a bit more monitoring and the likelihood of a CS sooner. But hopefully VBAC.