How am I supposed to nest?!?!?!

I'm finally on maternity leave and thought it would be great to finally get to do all the nesting I've been thinking about, but how am I meant to nest when I'm so enormous I can't breath by the time a reach the top of the stairs lol and just doing a couple of dishes makes my back hurt, I felt light headed just after hoovering the bathroom (tiny room)....it's great fun having twins isn't it, by the time I've cleaned the whole house it will need doing again! On the bright side my new washing machine was delivered today so I can't finally finish washing all the lovely baby stuff 🙂 (if my husband actually gets around to installing it 😉)