The lumen of the trachea is lined by pseudostratified columnar epithelium. Note that all the surface cells have cilia at their free (apical) surface. (What function do these cilia serve in the trachea?) Mucus-secreting unicellular gland cells (goblet cells) are interspersed among the ciliated cells.
Donât think you need to be able to do the modified version perfectly before you try theseâyou just need to feel brave enough to go upside down. To complete a handstand push up: 1  Face a wall in a standing position.  Kick your feet up so youâre in a handstand position against a wall.
Hereâs the kicker: thereâs typically one person in 25 who can actually do a pushup, and do a pushup properly. They take a lot of strength from the scapular stabilizers, specifically from muscles like the lower trapezius, serratus anterior, and latissimus dorsi.