3. Get Frightened
This is another one of the most common and popular recommendations: get someone to scare you! That is more easily said than done though, seeing as it’s much harder to be startled when you know it’s coming… so you’ll need someone who has the knack for this for it to work!
Either way, the aim is to get you to suddenly tense your muscles, to produce more adrenaline (which will put you in a sympathetic state) and to inhale air in a short way. You can try doing all these things on your own, but the method that is most effective is simply to get someone to scare you!
Of course the downside of this method is that you can feel rather foolish if it doesn’t work – as can the person whose job it was to scare you in the first place…