I'm not southern european, but it's retarded. For one thing, northern europe has a culture around physical fitness, which southern Europe sadly lacks (but it's getting better). Secondly, it's unnoticeable in day-to-day life because northern Europeans and southern europeans are more similar to each other than anyone else. You can go to India and obviously draw the conclusion that everyone is weak, but you can't draw this conclusion from actually visiting north+south Europe, just by looking at graphs.
Moreover, in a modern context, your physical strength is only the third most important thing and it's only important up to a point before its a detriment (muscle means mass means lower cardiovascular fitness after too much is gained). IQ and cardiovascular fitness are more important. Nobody's going to give a singular fuck that a Chinese person's hand grip strength is weaker than a swede's if chinese guns are lining people up to be shot. The British didn't care that a graph online says Spaniards are physically weaker than them when their fleet ended up underwater multiple times. The gauls didn't care when they became a Roman province.
And in spite of these charts and graphs, the US and Northern europe have the largest endemic issue of effeminate faggots being everywhere.
Furthermore, I consider that Israel must be destroyed