If you mean sutta form jhana, then you can just stand up. Of course, you can also re establish the factors that you had previously disposed of. First, if you're in fourth jhana, you would direct your attention to the obvious sense of body and the feelings present there. Then you would allow your mind to become enamored with those bodily feelings. Then you return mental thinking to the process of breathing. Then you get up.
The thoughts I've expressed in the above post are carefully considered and offered in good faith.
And friendliness towards the world is happiness for him who is forbearing with living beings. -- Ud. 2:1
To his own ruin the fool gains knowledge, for it cleaves his head and destroys his innate goodness. -- Dhp 72