These are Silver Sneakers classes; classes are free for people with Silver Sneakers membership.

Exercise safely. Silver Sneakers wants you to know this before you exercise:

Before exercise: 

You should always consult with your physician before engaging in any physical activity program. By participating in this online exercise class, you assume all dangers, hazards and risks of such participation. The exercises demonstrated by the instructors in this online class are physically demanding. If you are unable to safely perform these exercises, please modify them for your own safety or choose a different set of exercises.

For further information on the wonderful Silver Sneakers program, go here:

https://tools.silversneakers.com/