7 years ago I was apprehensive about attending my first mobility and core class. No way could I touch my toes or even consider myself flexible. I had my arm twisted by one of the trainers at AFA to go and I have not looked back.
I have slashed over 2 minutes of my running time for 5 km since starting to improve my flexibility.
It does not matter what level you are, from a complete beginner to someone who attends regularly. There are options and levels for every exercise.
If you are thinking about going but feel intimidated, suck it up and have a go. Take it from me, it's worth doing.