I want to get more exercise into my life, but I only have 20-30 mins a day and no money. I can’t run (due to hip problems) and I struggle to walk any distance (and especially up hill). I can’t swim and hate being in the water. I mostly work from home. Any suggestions of something else? Preferably something that I can do in the house. I’ve seen wall gym exercises, not sure whether they’re so good.