How "gracile" was arctodus simus?

[Hafstanni]

Arctodus simus is often considered to be gracile, but how gracile was it? Its bones seem very large and should have the space to support a large amount of muscle mass.
There are multiple depictions of this animal in circulation and they can't seem to agree on how bulky the animal was.
This one seems ridiculously gracile and I have serious doubts it would have looked like that in real life.

Then there are depictions that depict it as long limbed, but its limbs are well muscled and not gracile at all and should be extremely powerful.


Was it actually gracile or only considered "gracile" compared to other bears?

[arctozilla]

The claim that it had gracile limbs was based on the humerus width which is unreliable. Bones are protected by meat and muscles and it's scapula width and tibius and ulna distance that determine a forelimb strenght not the humerus width. By this logic lions and tigers should've massive bones.

[brobear]

I remember reading a book about Daniel Boone. When he first ventured far enough west to see bison, he returned telling the folks all about them. It went something similar to this; "Them buffalo is so big, you gotta look at one of them three times to see all of him. And that huge beast walks around on the thinnest little spindly legs you could imagine for something so big."