Up to 90 degrees should not be a problem for most and would be very good for arthritis clients. I taught 10 years in a therapy pool with those temps and never had a problem. Keeping an eye on the group for signs of heat stress and then adjusting as necessary works very well. Caution them not to go from the warm pool directly into a cold pool or shower. And you would progress them appropriately.
Great answers. I can only second the suggestions that your students clearly understand that they still need to hydrate frequently, even though they’re exercising in the water. Karin’s suggestion to make sure they’re not wearing bathing caps is right on the mark. With the water temp you mentioned the need to dissipate heat through the head is critical.
Have fun! Daniel
I agree with Karin. The increased flexibility will add years to the way they feel and move!
I have coached several classes in which the aquatic drills really helped my clients with the mobility problems they were suffering from.
The only other safety concern i can think of is knowing how to work around each persons physical condition in a way that they can benefit most.
Hope that helps.