站著說話不腰疼 [ㄓㄢˋ ˙ㄓㄜ ㄕㄨㄛ ㄏㄨㄚˋ ㄅㄨˋ ㄧㄠ ㄊㄥˊ; zhan4 zhe5 shuo1 hua4 bu4 yao1 teng2]
 it's all very well to talk, but getting things done is another matter (idiom)
 to be an armchair expert
 to blabber on

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