SAHM weight

I have two boys age 6 and 2, I’m currently a stay at home Mom taking online college courses and taking care of my little dude. I’ve been out of work for two years now and I’ve started to notice the effect it’s having on my body. I don’t have the money to go to the gym right now, does anyone have any tips, or at home workouts for me to try? Also, walking outside is what I normally do, but I live in Canada, and right now it’s just too damn cold for that shit. Thank you! I appreciate it.