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.

Swimming in a lake or the ocean is an exhilarating alternative to your usual pool routine. Here’s how to get started. By Amanda Loudin For many, the idea of swimming in open water is unnerving. The ...