Suggestions for work-out for my OH please

Ok, so here's the deal, New baby, breastfed on demand and worn in sling, add a 3 year old and a Home edded 10 year old, back not in the greatest of condition, pelvis still not 100% from far too much relaxee ligaments hormone during pregnacy.
We have decided that slow movement is going to have to take care of itself with general life stuff and walking places for now, strenght training is probably less important, lifting baby helps with that
, and will be harder due to back and pelvis issues.
So something that has the benifits of sprinting without having to leave the house as we just don't have the time* right now, and needs to be quick to do, with no special equipment and easy to learn.
*please don't say you make the time, we are already short on sleep, hardly ever sit down, on a good day we manage to get an hour to wind down after all kids have been put to sleep or beaten into a coma before we fall alseep where we stand, I just about manage sprint a week as I can do it on the way to pick up 10yo from the station when he comes back from his dads, nomally manage 1 LHT, often with a 3yo providing extra weights on the squats and playing horsey for press ups and planks, though at least I get a breather by hanging her off my pull up bar for a minute, luckly for me the littlest one like to be taken for a walk in the evening so I get my move slowly then, so if anyone says make the time I will hunt you down and spend an entire week being as demanding as 3 kids at you then you will be sorry
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................