Started taking these again about 5 months ago, and have been mostly been enjoying the experience.
Now that I've been doing it for a while, I have decided to dedicate myself to just being a part of improv. I'm noticing quite a few remarkable changes in how I think and how I behave around others. I can attribute much of the change to the exposure to improv.
To those who don't know - improv acting is all improvisational - no script, no direction. Just a suggestion offered, and a few simple rules to follow, and you're off and running, improvising!
The few simple rules for improv:
1. Stay focused on the present moment
2. Make your partner look good
3. Say "yes" to what is offered to you
4. Create and respond without expecting an outcome
5. Have fun (play)
6. Make mistakes - PLEASE!
7. Follow your heart (be emotionally aware)
There are a few more, but these 7 right here are the guidelines of improv. They're also quite awesome for general practice in life. I've taken quite a lot to it, because much of it applies to practicing Buddhism as well.
I strongly recommend it to anyone wanting to try something different.