The order you need to take is numbered on the mattresses.
Jump on the first pole. It will rotate. Jump again on the wall.
Do a lateral jump.
Then a backwards jump.
We're keeping Lara in shape, that's for sure!
Start rotating and jump on the wall.
Then a lateral jump to your right.
And a backwards jump to grab onto that secret enclosure.
Push the button, and some polls will rise from the ground.