I currently take a cardio class.
The teacher will be aware that this is your first time in, or maybe not, you can always go talk to her or him before class and let them know.
My cardio teacher talks and guides you through the whole class. There are lots of time throughout the class that there are different levels of doing a certain move. You can do the higher impact, or the lower...you can modify the movements to fit your physical capability.
I say, give it a try, it's so much fun, and you feel like you got the best workout! Good Luck!
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