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salad
Chak
tallsam
Essentially, it's supposed to help you during the weak stroke when you pedal. Two sides of the same coin.
Whether it actually works on not, seems to depend on each person and the billion and one forum/video/blog/tweet/article you can be arsed to read.
I have, and wish I didn't. @Vbulman summaries my thought on them now quite succinctly.