Off topic a bit, dad was a pretty tough old lumberjack and he taught me how to crack wood with a double bitted axe by letting it roll over after contacting the wood, thereby leveraging the block apart. It used the opposite end of the axe as a counterweight to pry wood open. It often throws wood a few feet with violent force. It's very effective and punches way above it's weight. It works with all axes and even cruiser axes but the big double bitted axes are best.
But honestly, I split most of my wood with the chainsaw for a few reasons. One, it's easiest. You don't even break a sweat. Second, I can stack that square or rectangular shaped wood nicely in the stove for tight overnight fires. It also stacks nicely to make the ends of the wood pile so I don't need posts at the ends of the stacks to hold the pile up. Lastly, I used the long curly shavings in my shrub beds and garden for compost and ground cover to keep the weeds down.
You can see the chainsaw-split ones at the near end.