Splitting wood with a retaining chain and bungee cord:
This splitting firewood video features a wicked-good looking splitting axe by Fiskars. It looks to me like their X series splitting axes that come in 17″, 23 1/2″, 28″ and 36″ lengths. The geometry of the axe head creates a wedge whose top curves outward sharply – looks very effective.
Fiskars splitting axes on Amazon
Fiskars 7856 X11 17-Inch Splitting Axe
Fiskars 7853 X17 23-1/2-Inch Splitting Axe
Fiskars 7854 X25 28-Inch Splitting Axe
Fiskars 7884 X27 36-Inch Super Splitting Axe