Many people feel uncomfortable in the water – and twice as uncomfortable being underwater. For many service members, getting in the water is key. You must swim, tread and place your face in the water ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you’re looking for a new way to do cardio, swimming is surprisingly effective—and a total body burn.

The digital clock reads 5:30 a.m. Outside, darkness blankets the neighborhood. While most people remain wrapped in the comfort of their beds, a growing community of morning exercisers laces up shoes, ...