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.
Starfinder Character Operations Manual © 2019, Paizo Inc.; Authors: Alexander Augunas, Kate Baker, Simone Dietzler, Jennifer Dworschack-Kinter, Leo Glass, Sasha Lindley Hall, Amanda Hamon, Vanessa Hoskins, Jenny Jarzabski, Jason Keeley, Lyz Liddell, Luis Loza, Ron Lundeen, Crystal Malarsky, Robert G. McCreary, Conor J. Owens, Joe Pasini, Owen K.C. Stephens, Jason Tondro, and Landon Winkler.