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.
Begin in a pushup position on the hands and toes. Bring the right knee in towards the chest, resting the foot on the floor. Jump up and switch feet in the air, bringing the left foot in and the right foot back. Continue alternating the feet as fast as you safely can for 30-60 seconds.