Unlike most sports, you can be moving for a long time but the distance you cover leaves you with the same sights as when you started. But, your body still knows you covered a specific amount of distance even though you are just swimming 25 yards at a time.
I really appreciate my good health when I swim.
I love how my muscles work to keep me moving. Stroke after stroke, they contract and relax to help me power through my strokes. Sometimes my muscles get tired and boy oh boy do I feel it, but then I really appreciate my good health in knowing that with a little rest I can still repeat my effort in the next 24-48 hours in the water.
My lungs and heart are so important when I swim and I do not take them for granted. You never realize how much you love oxygen and the simple gift of breathing, until you jump in the water. Short breaths every 3-5 strokes and a constant build up of carbon dioxide until you finally get to rest at the wall. And then you get to do it all over again until the warm-up, main set and cool down is complete.
Plus, it was super fun to just be in the water and my parents always knew that when we went to any type of pool for fun, that it would be a struggle for me to agree to leave when it was time to go home. I remember always telling my parents, "just a few more minutes..pleeeeease???"
Main set #1:
6x's (with 20 sec rest in between, continue repeating until the 6 rounds are complete):
150 strong (~90%)
100 steady (~80%)
Main set #2:
6 x 50's (odd ~80%, even ~90%) w/ 10 sec rest
(if your form suffers, take extra rest)