<human>: Can you condense the text into a few key points?

Hi people of r/relationships!

This isn't the first time I've posted here, nor will it be the last because I really appreciate all the positive support and advice you all give. So thank you.

Now that we've gotten that out of way, let's get to the issue. 

So my S.O. and I have been dating for about 2 years and things are going wonderfully. We are talking about proposals, our sex life, our jobs, chores, bills etc. It is a very open relationship.

 I have always been more physically fit and slimmer than her and that has led to small tiffs that usually end with me convincing her that I find her attractive no matter what. She is by no means large, but she has some curvy hips and upper thighs which I find very attractive. However since we've started our new jobs as teachers we've been getting pretty lazy in the evenings and weekends. We spend most of our time recuperating from having our energy sucked from our souls by small children all day. She's been putting on weight to other areas of her body and I can tell it's bothering her quite a bit. She says she wants to start shedding the extra "pudge"  by running and exercising a bit. I don't know how to support her with that exactly, other than starting to exercise myself and by leading by example. 

I agree that if she wants to start shedding those extra pounds she should! However I am also no fool as to the fact that weight is a very sensitive subject with certain women. (My S.O. also has a history with being bullied throughout her childhood) I want to be as supportive and sensitive as I can be while still encouraging her to drop those extra pounds and get back to that bodacious body because I know that that's what both of us really want.
<bot>: S.O. of 2 years is putting on some pounds and says she wants to start working out. How do I help support her with that without making her think that I think she's too fat?