Nope.Skeletor was on HGH and cared about his body all year long. You could tell he was a bodybuilder by day and martial artist by night.
He knew how to fight.
Even Arnold Schwarzenegger was proud of him.
Mumm-Ra is nothing but a bag of bones and is tiny as a dwarf.
If it wasn't for his religious chant, he would get stomped on real quick.
I bet one swift uppercut to the chin would break his jaw bone, preventing him from accurately reciting his lines.