After couple months of abuse, I finally broke one of my 3/4" thick pine
wood board in half (2 halves of full length, half the width; the broken
line is somewhat parallel to line where the strips of pine wood are
glued together - done by the factory). The jump was high but not that
high and the landing was rough but not that rough.
I was expecting the boards to be much stronger than they are.
This board has 2 or 3 layer of Varathane and I haven't broken the one
with 4 layers of Varathane yet.