What if you could melt fat, tone your body and feel like a kid again—all in just 10 minutes a day? Fitness legend Denise Austin, 69, says you can, and the secret is as simple as jumping in the pool.

You could feel the energy in Saratosa, Florida, radiating from every square foot of water. Athletes lined up, eager to compete for their school. Coaches stood around, anxiously awaiting their swimmers ...

At the break of dawn, a group of swimmers step into a quiet lake, scanning the open horizon. There are no lane lines, no black lines on the bottom of the pool. Simply the water, wind, and the unknown.