Some good variations:

straddling a triangular wooden beam supported by a central post

straddling a triangular steel box supported at each end by posts

straddling a very wide and tall triangular wooden box made of planks on the floor

straddling a wooden beam supported at each end by chains

straddling a round pipe mounted to a vertical pipe behind her,

Some things you can specify:

Views:

frontal view, side view, 2/3rds view, rear view, low angle, high angle, full body,

The beam:

wide , tall , long, small,

Different materials and support methods

Pose:

Legs doubled back

legs down