quality threads by ironneck all day long bitches
Though they aren't the most physically imposing,
the Japanese are pretty tough due to their fanaticism in war time.
Arabs and Afghanis are also pretty indomitable, and they have a stronger build.
For every German that died in WWII, at least 10 Russians died; Russians are pretty tough.
Having said that, Germany, a relatively small country, took on the entire world, so that's worth something.
The Spaniards were known as very tough people. They've been through the bloody reconquista, and the subsequent expulsion of Jews and Moslems.
During the early modern era, mercenaries like the German Landskenechts and Swiss Pikemen, would sometimes retreat from the onslaught of Spanish Tercios.
The Basque, even when they were known as "Vascones" by the Romans, were considered exceptionally tough and indomitable.
British (not the Brythons, but the Saxons and Scots) people are tough.
The Anglo-Saxons pushed the native Brythonic Celts all the way to the western shore, and the Romans were terrified of the naked, fanatical Picts,
that came to be known as Scotsmen. British people have been through terrible civil strife since antiquity;
not to mention, they built an empire extending from North America to Hong Kong.
American Indians, Turks, and Latins are tough.