In high performance sport, if an athlete tries an intervention that we know only works in the context of placebo, then placebo has very powerful psychological effects. If somebody really believes in the pain relieving or the healing properties of this placebo, it's only going to be a matter of time before they try and use it to treat something that requires an actual medical intervention. We can untangle that later. Let the man get a point of- All right, sure. I'm doing a talk about pseudoscience in distance running at the London Marathon Conference. And one of the products that are often sold to runners are massage guns. These things you can hold and you push them into the muscle and