I've just been reading another post - Sensei and Size, and it's rather interesting.
So I thought, does being heavier (larger centre) improve one's Aikido?
Due to greater ability to keep weight underside and being more balanced/stable.
As I wrote in the other thread, my experience of training while pregnant (now 6 months) has been to find a better connection with the ground, greater ability to use 'weight underside' and having that extra bit of mass to put behind techniques has improved things for me.
On the downside, I can't take ukemi so easily (bump gets in the way) and will probably have to stop forwards rolls soon, plus getting back up from the ground is so
I'm slower than I used to be too.
Balance hasn't been an issue so far - I seem to be keeping up with my changing centre ok
Overall I'd say that once I lose the baby weight and resume training, I'll be back on better form having gained some new insight, but I'll get back to my pre-pregnancy weight (and as near as I can shape!) as overall this is more comfortable for training long-term.