Weight gain role play with my gf.

There are a few games my girlfriend and I play as far as weight gain role play.
By far my favorite is when she dresses up in her workout clothes and I pretend to be her personal trainer.
She'll squeeze into yoga pants that she cant get over her tummy and a sports bra while I play workout coach.
Last time I started with,
"So it says here you've gained a little weight and you want to get back in shape. What happened?"
She said,
"Well I used to eat whatever I want and just stay skinny. Now it feels like everything I eat just goes straight to my middle! I never used to go to the gym and I never diet, but somehow it's all catching up with me!" *pats belly*
Me: "You do have a bit of a pudge. Lets start with some jumping jacks. Give me ten!"
From there I have her doing pushups and situps until she's sweaty and out of breath.
After she's done I suggest,
"Well I know one way to burn a few calories!"
And you can probably fill in the blanks from there.