Legs like a Sumo Wrestler

You can go far on legs like those.
It was supposed to be an insult but I don't know how it goes.
Strong for climbing, straight for standing,
Strong for jumping, flexed for landing,
Soft and supple, smooth and long,
And very, very, very strong.

"I'm not trying to be funny," said a man, "but she has legs like a Sumo wrestler." "Yes," I said, grinning (somewhat forced, but there you go) "aren't they fabulous?"