I have a lovely large home and am a SAHM to 2 under 5.
There's good bits and bad. I love being able to pick my eldest up from school, never having to worry about making it to an event at school, having time to help out at school, no worries over holiday or sickness cover, being able to facilitate play dates etc.
when both are at school/nursery a couple of sessions a week its nice to potter and have to time to get jobs done or sit with a hot drink.
It's quite lonely though, I do go for the odd coffee with friends /play date with my youngest but once they are at full time school, I'll be alone a lot of the time. I don't live where I grew up or worked, so don't have a large social circle, just mum friends.
I had a good career but it wasn't compatible with being around for my children and part time ended up being full time work, full time stress, with part time hours/pay. DH works long and unpredictable hours but earns significantly more and has ensured we, and our children, are financially comfortable.
It's also hard and unrelenting being a SAHM, one of my children is particularly difficult and I'm often exhausted by the end of the day. If I'm sick or injured I still have to 'work'. My DH is very hands on when he is home though so I'm fortunate.
As for the gym, I should go, I'm quite overweight!
I wouldn't say I'm unhappy as I appreciate how fortunate I am but I wouldn't say I'm particularly happy. I have a lot of issues from my past (narc mother/unstable childhood) that I find it hard to move on from no matter how much I have. I'm doing what I think is best for my family though.