There were incidents where a handful of SSG blokes annihilated Spetsnaz alpha in direct encounters. The element of surprise has a key role in the success of special forces as the other side also has training and guns and they are not there to play. As Pakistan Army was established upon the guidelines of the British Era, SSG's training is almost identical to SAS, only that Admiral Syed preferred to be in close connection with S.E.A.L unit for the training arrangement of SSG-N. I have personally met somebody who along with another bloke held 50 indian black cat commandos back for 24 hours and at the end escaped with no injuries with 20-30 dead black cats. Russians are downright tough yet if only size mattered, Scandinavian special forces would rule the world and Gurkhas would never be mentioned. The legend of Gurkhas is also due to a special factor i.e their stamina due to centuries of high-altitude living which gives them an edge when all comes to having the ability to deliver the last blow in a one-on-one fight. They are bad at flat surface-runs though. Also, adrenaline control through training is a factor too, a little less and you won't be agile enough; A little more and you'd be shaking even before a fight.