I just got back from the beach. It was so relaxing.
The physical sensation of putting your feet in warm sand causes people to relax
Agreed! Life is stressful, so getting to relax is important.
When we relax, the flow of blood increases around our body giving us more energy.
How interesting! I didn't know that. The flow of blood reminds me of the flow of the ocean.
The ocean is a continuous body of salt water that covers more than 70 percent of the Earth's surface.
Aren't our bodies around 70% salt water? 
Salt water examples include Pacific Ocean, Indian Ocean, Great Salt Lake, Salton Sea in southern California, and Mediterranean Sea to name a few.