It is the first exercise from Olympic weightlifting. It can be performed in different styles, but the main ones that we can see now in the Olympic weightlifting competitions are:
1) European Style (or classic one)
2) Chinese Style (or no foot style)
3) The Bull Snatch style (specific for taller lifters)
If you want to see a more detailed explanation of these 3 snatch styles, check out this video on YouTube The Types of Snatch | Olympic Weightlifting
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