While a 30 day squat challenge is a great way to challenge yourself, you shouldn't do the same squat exercise everyday. Doing different squats target your glutes from multiple angles and shape the perfect butt.
Ballet Abs - I don't remember doing any of these separately (except for crunches) when I use to dance. I got my "ballet abs" by holding it in during class for 10 years; however, these exercises are great for anyone.
Beginner CrossFit Workout - To truly make this a CrossFit workout it has to be done with intensity for time - not just going through it at a leisurely pace. Also, I've NEVER done reverse crunches in CrossFit - so I'd change that to a different exercise