Legs spread very wide without any support

This set is from Michael Stycket collection.
I wonder how did this muscle model spreading legs on knees vey wide (180 degrees..OMG!!!) without any support.
Staying in this position even for seconds puts lot of muscle pain. I feel model is not happy in this position..
Just thinking these pics could be graphic edits??or optical illusion??
I have no clue.. Any thoughts?

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