That's a great way to think about it! Your body DO deserve a Mom who can play and keep up with them, and you will get there
Why not skip the first part of family meal for a few days, set the table, serve the food, and then go for a walk around the block. Come back, make your shake, and finish up the meal all together. could be a good way to get in exercise AND keep away from the most tempting part of the meal (when everyone is digging in) but still be there for the talking and the quality time
This is a rough road, but we're doing it and we're kicking butt at it
Baby steps forward will get you there, keep up the awesome work!