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.
A Triceps extension push-up can be performed as a bodyweight exercise only and is thus an ideal substitution when weight lifting equipment is not available. To perform a triceps extension push-up, a person begins on the ground in a plank position with their body supported by their feet and forearms.