Nicole wants to thanks all the logs for their kind participation and their willingness to split on demand (if you don't count the ax persuation).
And def remember to let the tool do the work. The motion, guidance, momentum, that's all the lumberjack's purview but don't try to drive the axe into the wood. You will quickly exhaust yourself and the axe will bounce in weird directions. Y'all be safe! (and I hope you're safe with all the Canadian fires going on right now!)
Unless your logs are perfectly cut, its better to use a slightly uneven stump so you rotate the log on top of stump till it stands up straight. Don't put the log you are trying to split in the center unless you have a huge stump. Put the log on the far end of the stump away from you so that when the axe or maul swings through the log it goes into the stump. Bending your knees near the end of the swing adds power and keeps the head of the tool more in line with the ground and is safer.