The first one works if you just straighten your bottom leg and kick. The second one is great, but it hurts your pelvis bone, so get a yoga mat and support your pelvis instead of having your hands in front of you.
Brazen fit 24 day ab challenge - the fact that you saw this means that you should do this! It's just 24 days! You have time to give the necessary minutes every day for this. Remember YOU ARE MEANT TO SEE THIS AND DO THIS!