The obliques have three main actions for our bodies:
* Lateral flexion (sideways bending)
* Rotation (twisting)
* Flexion (rounding)

They help to create tension through the core and are an integral part of building a strong and stable core.

Here, you have a workout that incorporates all of those movements so that you could approach your abdominal workouts in a more rounded way (i.e. covering more than just one muscle group) than simply doing crunches.

NOTE!
The last exercise is rather demanding. Please start with smaller range of movement, keep your hands on your hips instead of having them clasped behind the head and skip the twists at the end. You can gradually add those elements once you feel more in control and stabile on your feet.
This exercise also challenges your thighs, glutes & balance.

Relevant time stamps:
00:38 the workout sequence begins with twists
03:14 important note about the hips when twisting
03:36 important note about the arms when twisting
04:39 hip tilts
08:10 good tip
09:02 series on high kneeling begins: floating arms, arm reaches & side reaches
14:06 good tips
15:01 advanced obliques in wide second position (PS! There is a note about this exercise in the description above!)