Improved Kip-Up Feat
You can stand from prone in a blink of an eye.
Acrobatics 1 rank, Kip-Up feat or moxie racial trait
You can stand from prone as a reaction. If you have 5 or more ranks in Acrobatics, you can expend 1 Resolve Point to stand from prone during your turn as part of another full, move, or standard action you take.