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.
The push-up exercise may just be the perfect workout. Although it focuses on two muscles, all your muscles must work to move your body up and down as you hold your own weight. It is an amazing upper body exercise and an excellent total body workout, challenging your core at all times. If performed regularly, push-ups will promote muscle endurance and overall fitness.