When I was a kid I went to confession and for my pennance the priest told me I needed to split an old log into firwood he had laying behind the monastery, either that or say 10 rosaries. I chose the log, looking back I am pretty sure it was elm, it seemed like I pounded on that thing everyday after school for weeks to get it split. I triesd another log later in life and ended up putting a deep kerf on each side with my skill saw.