If you’ve made it onto this article, you’re probably looking for a challenge that goes beyond your usual workouts. Yes, you’re comfortable with getting a sweat on and happily grind out reps in the name of burning fat and building muscle, but what if you were tasked to keep pace with the world’s most challenging military workouts?

From the British Special Air Service (SAS) to the US Navy SEALs and Israel’s Sayeret Matkal — their training methodologies are designed to push you to breaking point, both physically and mentally. There’s a reason why these guys are the elite.

Here, we’ve pooled our resources together to compile a catch-all approach to unlocking the fitness secrets of the world’s deadliest, strongest and fittest professional soldiers. Lock and load.

Source: Military and Army Workouts: SAS, Special Forces and Marines Training – MensHealth