I went to the water Zumba class at our pool today.  It was fun.  This time I did not swim first, plus the air was warmer, and was comfortable.  I also made sure I had a good breakfast this morning.  During was portion of the class we use water weights.  The woman who organizes the group has two sets and took me a lighter weight set to use.  My arms, thanks to my shoulder, are not very strong & it felt good to work them.  I might go again on Thursday depending how I feel tomorrow.