i have receintly started using floor presses as a part of my tricep routine and im feeling it great
I started since i put chest and tris on the same day
As you have already trained chest ur elbows arr going to be warm and to can get straight into it after a 'feel set'
To perform the lift you lie on the floor in a power cage and set the bar up like in a bench press
I take a grip 12 inches apart as this is best for me
Lower the weight slowly untill ur triceps are completly on the floor, then explode up and squeeze the tris hard at the top, tying not to lock out to hard
I find this a great exercise and feel each head has been blown away the next day, just thaught i would share with you so u can try it out if u dont already