Not to sidetrack from the original question, but the type of wood you're splitting might be the biggest factor in deciding the most efficient way to go about it. I split around 6 cords of ash a year with a fiskars splitting axe, while my hydraulic splitters sit in the barn. Its just a lot faster with the axe, and more enjoyable. A different species might change that.I’m with 49ereric. As much as fitness is talked about here I’d think everyone would be splitting by hand. An 8# maul and a good chainsaw is like your own personal gym.
If you're interested in turning a wrench you might have good luck finding splitters with blown engines - I picked up two for free over the years, and very inexpensive Honda engines to go on them.