The existence of the ProtoIndoEuropeans (formerly referred to as Aryans) was once argued purely on linguistic evidence, but recent analysis of DNA of the Yamnaya culture and related steppe cultures, demonstrates their genetic legacy on IndoEuropean cultures in a timeframe that matches the expansion proposed by linguists.

Most interesting of all, despite the fact these people started off in the Pontic Caspian steppe of Eastern Europe, modern populations in all of Northern, Central and Eastern Europe all have a strong genetic affinity with them.

This video explains what genetic and linguistic evidence tells us about how they lived, what they looked like and what their pagan religion was like.

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Sources:
Massive migration from the steppe was source for IndoEuropean languages in Europe
http://www.nature.com/nature/journal/...
Steppe people had healthy genes
http://biorxiv.org/content/early/2017...
90% of British DNA replaced in Neolithic by steppe descended invaders
http://eurogenes.blogspot.se/2017/05/...
3 populations make up modern Europeans
https://drive.google.com/file/d/0B016...
Culture and language among Corded ware people
https://drive.google.com/file/d/0B016...
https://drive.google.com/file/d/0B016...
Anthony, D., 'The Horse, the Wheel, and Language: How BronzeAge Riders from the Eurasian Steppes Shaped the Modern World'
https://amzn.to/3wOUyUQ