Here's the technique Navy SEALs use to swim for miles without getting tired

With the beginning of summer, pools all over the US are opening for recreational swimming — but in the Navy, recruits are getting ready for the brutal Basic Underwater Demolition/SEAL training, or BUD/S, that will turn some of them into Navy SEALs.

In the SEALs, where recruits of the elite special operations unit are pushed to their limits, there is no room for inefficiency. So it developed a more efficient swimming stroke: the combat swimmer stroke.

The stroke combines the best elements of breaststroke and freestyle to streamline a motion that not only reduces resistance on a swimmer’s body, but makes the swimmer harder to spot underwater.

Here’s a sample of the stroke:

Unlike freestyle, the combat sidestroke calls for the swimmer to stay submerged for most of it.

To do the combat swimmer stroke, dive in or kick off as you would in freestyle, but at the end of your glide, do a large, horizontal scissor kick instead.

Now comes the unique part — as the horizontal scissor kick tilts your body so that one arm is slightly higher than the other, pull that arm back while leaving the other outstretched.

Turn your face up toward the surface as you pull that arm down, take a breath, and begin to pull down your other arm. Another scissor kick, then reset your arms. You should not switch your orientation or the order in which you pull back your arms.

Here’s a step-by-step breakdown:

TOP ARTICLES
This is how missing or captured troops get promoted

According to the Department of Defense, prisoners of war and those under missing status continue to be considered for promotion along with their contemporaries.

6 reasons Charleston might be America's most gung-ho military city

From Charles Towne Landing to the Medal of Honor Museum, go grab a pint where George Washington drank and read about the military legacy of South Carolina's Atlantic jewel.

This is how long South Korea thinks it will take to conquer the North

South Korea says they are developing new plans to defend against advancing North Korean threats after a data breach left their outdated plans vulnerable.

This stunning video shows how well 100-year-old ammo works today

While original 1911 pistols surely still function today, turns out so does the ammo from that era.

This could be the Army's next rifle — and it's totally awesome

Textron debuted its newest rifle, the Intermediate Case-Telescoped Carbine, at AUSA. It's lighter and more deadly than the current M4.

16 jokes Germans could die for telling under the Nazi regime

The Nazi Party was well short of a majority when it came to power. So it's easy to believe that not everyone was a big fan of Hitler or his ideas.

These really smart people say bigger is better when it comes to building aircraft carriers

In an effort to reduce its fiscal footprint, the Navy is looking at making smaller ships. But these defense researchers say it's a terrible idea.

Now that ISIS is on the ropes, these guys have turned the guns on each other

Two US allies, which were armed and trained by US forces, have turned their weapons on each other, and there isn't much the US can do about it.

This is the definitive history of the world's most advanced fighter jet

The new F-22A Raptor fighter jet is the most advance fighter jet in the world, and it dominates on every level imaginable.

This is how the $102 million B-1A almost replaced the B-52

The plan was to buy 240 B-1As to replace the B-52 as the Air Force's primary strategic bomber, but eventually, they each found their place in the force.