A 'trick' I got in my email the other day was to put a mouth guard in your mouth so you can clench your jaw tighter without damaging your teeth.
Apparently -
Says it increases strength by 17%. I haven't tried this so I can vouch for itThis not only transfers power to your lift, but also taps your
adrenal glands (your "fight or flight" hormone) to increase
secretion and provide you with a burst of "slightly less than
super human" strength.


