I love to swim.  I'm so happy it's almost summer!
I love swimming as well especially in fresh water to play sports and exercise.
What kind of exercise do you do in the water?
A lot of physical exercises that tones your whole body and keeps your health great.
Do you use any equipment for that?
No equipment the water makes it seem like you are holding weights yoga is good also hatha yoga it masters the body along with mind peacefulness.
Interesting, yoga in water.  It never occurred to me!  Do they have groups that do this together?
Yes a little background Buddhism and Jainism they practice yoga different variety of yoga schools.
That is all very good to know.  I will check it out!  I can see myself doing this.
Yes look into it it is great for you also look into Hatha yoga and Raja yoga they are very well known.