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.
Hold for three counts and then lower. Work up to 3 sets of 10 reps on each leg. Seated Press-Ups Engage your shoulder and triceps muscles with this joint-friendly move. Sit on the edge of your chair with your arms by your sides, palms over the edge of your seat. Press down with your arms as if you were going to try to lift yourself off the chair (you don't have to lift up). Hold for three counts and then release. Work up to 3 sets of 10 reps.