It might work for some but I still had a back to back baby despite a minimum of 45 mins daily dog walking, swimming, doing all the housework, lots of ball bouncing and daily exercises from Spinning Babies which are supposed to encourage a B2B baby to turn. I wasn't exactly Superwoman like Hazle but exactly how upright/active do you have to be to turn your baby? 
Re balls, DH burst my birthing ball while he was drunkenly wrestling the dog around the floor on it so I replaced it with an exercise ball which was £5 from Tesco which was exactly the same.
Alex don't feel guilty about relaxing, just make the most of it! As lovely as motherhood is, you will reach a point sometimes where you are jealous of DH's full nights sleeps and the fact that he gets a 'break' by going to work. It gets easier as time goes by but it is very much a round-the-clock job.
I know what you mean Purple, the prospect of a long, dark, cold Winter with a baby to entertain is quite a daunting one. I plan to join a few classes when Elodie is 16 weeks which should get us out of the house a bit more, along with weekly swimming and playgroup. And I've just bought a nice thick pramsuit for our daily dog walking. Not exactly a rock & roll lifestyle but it's a start. 
Mother can't your OH cook the evening meal? In the early days of being on my own DH made me a packed lunch so I could just grab it out of the fridge and then DH would cook dinner when he came home from work.
'Operation self-soothe' went slightly better last night but still had me up for 2 hours 2-4am.
She only took 3oz at 10pm as she was too sleepy so woke hungry at 01.45. I fed her, put her down and she was back asleep in under 5 minutes, so off I went to the loo feeling smug that I had cracked it, only to come back to find her wide awake, thrashing around and hitting herself in the face.
It then took me nearly 2 hours to get her back to sleep without picking her up.
She then woke up hungry at 7am so I fed her, put her down again and she went off to sleep but stayed asleep this time so we both had a lovely lie-in until 10.
Not ideal but small steps in the right direction and it's over 2 days now since we last rocked her to sleep.
She has now been back asleep since 12 and they do say sleep breeds more sleep so FX for a better night tonight.