Drill numerous holes.

Soak in Kerosene.

Burn.


I would not advise this. Being a Vol. Fire fighter..........a root
fire can occur..........a root could smolder for days or even weeks
and sprout a brush fire somewhere down yonder.

Other than the stump grinder; You could always take your aggressions
out on it with an axe and shovel. I wish your muscles happier days
ahead :-)

Dean