Hi B.---Do NOT give up your classes. Exercise is ESSENTIAL. You have to be in a good place, mentally and physically, so that you are a better mom for your kids. Think of it like the airline emergency instructions. You must put on your oxygen mask first, before the kids, because if you pass out, you're good for no one.
I also agree that you are setting an example for your kids. You may want to do a few more things at home WITH your kids like running games, walking or riding bikes to get them involved and started down a good path, knowing that regular exercise is just something we do.
I am taking wellness classes, and I've learned that exercise helps us, not only physically, but mentally. Exercise is better than drugs for depression. Scans of older people show larger brains when those people exercise regularly. The brain actually shrinks w/out exercise. Of course, strength training helps to keep muscle mass, which we lose as we age. Muscle burns more calories, so we can minimize weight gain that occurs w/aging. Muscle and core strength keep our bones strong and help with balance so we are less likely to break hips. Running and 'pounding' activities 'push' blood and nutrients into the joints, keeping those healthy as we age.
And don't forget to fuel your body for protection. Exercise is essential, but we also produce more free radicals when we do. So your 10+ servings of fruit and veggies are essential as well. I've got lots of great info and tips on how to incorporate more fruit and veg into every meal, so if you'd like, please let me know and I can share those with you. But be sure you don't rely on isolated vitamins to fill in the gaps. They don't work like food does. I have lots of great research to support that, and some suggestions on what you CAN do to fill in gaps. I look forward to talking to you soon. D.