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I think that "слабак" is the most universal. It can be used literally (a physically weak person) and figuratively (a wuss).

There are also "размазня" and "тюфяк", but they mean mostly "an...

Aga. Думаю, ты прав. :)

Was there a link? :)
You can watch the video here:
http://www.youtube.com/watch?v=zGzivcmKQDg