These are a great programs to work on and even start with since hamstrings are such a major muscle group. The flexibility and strength level of your hamstrings affect and influence your performance in all your aspects of your life, not just kicks or splits, not just dance, gymnastics or martial arts techniques. Tight and weak hamstrings can cause a lot of troubles, the most well known being lower back pain.
How do I pick the right level for me?
In order to pick the right level you can do a simple test. Answer this question: can you reach your toes having legs straight either sitting or standing?