In mainland China, paramilitary policeman face an intense regimen. Here, the policemen take part in a training session in muddy water.
Later in the training, the paramilitary police also have to crawl under fire obstacles ...
... and hone their hand-to-hand combat skills.
Training is sometimes aimed at pushing troops to their absolute limit: Here, paramilitary police in China train at holding their breaths underwater.
Meanwhile, in far northern China, soldiers train in temperatures as cold as -22 degrees Fahrenheit.
In South Korea, members of the country's Special Warfare Forces also train in icy conditions.
A Canadian soldier in Latvia takes part in ice-plunge training as part of the NATO exercise Operation Atlantic Resolve.
During joint exercises, US and South Korean Marines train together in the South Korean mountains.
US Marines also take part in annual joint drills with their counterparts in Thailand, in tropical environmental extremes. During the jungle-survival exercises, Marines have the chance to drink cobra blood — something they might have to do to stay alive in the field.
Here, a US soldier in the 10th Special Forces Group jumps off the ramp of a Chinook helicopter with his military working dog during an exercise.
Over in Japan, members of the Ground Self-Defense Forces practice holding onto a rope while dangling from a cargo helicopter.
In order to pass the final stage of a nine-week Amphibious Training Program, trainees in Taiwan have to crawl on their belly through a 150-foot path of jagged coral and rocks.
In Belarus, servicemen must pass through an extensive and difficult obstacle course before becoming members of the elite "Red Berets."
The Red Berets stage annual displays of skill where some troops head butt flaming concrete blocks.
Militaries around the world put their soldiers though endurance challenges. In Israel, soldiers from the Golani Brigade must complete a 43-mile march to finish advanced training.
Enemy forces in the region have clearly taken note: In the Gaza Strip, Palestinian militants from the al-Aqsa Martyrs Brigades train in military drills to prepare for future battles against Israel.
Other Middle Eastern militia forces put their fighters through intense-looking training. In Syria, members of the Kurdish YPG train on monkey bars and fire obstacles.
Like the YPG, Iraq's Shia militias are one of the major ground forces fighting ISIS. Here, members of a militia demonstrate close-quarter combat skills at a graduation ceremony.
Other Shia militias in Iraq require their members to take part in desert field-training exercises before graduation.
You've seen some of the most intense military training regimes around the world ...
