Mark Verstegen, whose EXOS institution trains elite athletes from Major League Baseball to the World Cup, joined Hamilton to create "Get Speedo Fit" in hopes of getting athletes in the water.

What It Is: WTRX, an updated take on water aerobics, created by Speedo USA and Life Time Fitness Who Tried It: Julie Mazziotta, writer/reporter Level of Difficulty: 7/10. This isn’t your grandma ...

You can 100-percent utilize equipment under water, and Speedo USA has just the thing ... One reviewers even takes these with them to water aerobics class for added intensity.