What I usually do to crack my sternum is to inflate my chest as much as possible and lean backwards, it doesn't take a whole lot of force. I think that, like other joints, it helps if you stretch and keep it limber (though it is something that is strange to loosen up). If you want to be able to crack it, look into some yoga or contortion (specifically frontbending).
J
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RE: How many joints can you crack?