To ask how to make the most of after school time

[Milkandcreaminmine]

After my daughter started school in September I rejigged my work around so I could pick up three times a week. I have a 4 y.o and a 3 y.o but I feel like I don't make the most of that time resulting in me being grumpy and them watching too much t.v! In the summer it will be great to get outside and go to the park but I'm struggling in winter.
Money is tight so going swimming every week or to softplay isn't really an option. I'm wondering about
1.) doing an exercise dvd or YouTube yoga for an hour
2.) getting them to help me paint the house ()
3.) extra learning (learning Spanish together or choosing a topic and planning a lesson for them.
4.) baking/ batch cooking

What does everyone else do?

Mine tend to be pretty tired after school and glad of the break, in winter we often have a milky drink and a sit down on couch watching a short film like Wallace and grommit before books and tea