I walk too and from the train station that gives me about 30 min of walking a day during the week. I would like a 20 minute home program that requires very lit

I walk too and from the train station that gives me about 30 min of walking a day during the week. I would like a 20 minute home program that requires very little machines. I did get some books to that effect, but I need to go through them and put it together