How to short the market

Here are a variety of links, please note this not investment advice from me and I am not myself short the market.  Still, 85% of my Twitter feed seems to be short the market, in fact radically short, so I thought I should blog (descriptively, not prescriptively) on this topic at least once and report what they are doing.

I am worried about the impact of the stronger dollar, here is Adam Tooze on that topic.