This is a staple exercise for many lifters. The floor press is simply bench pressing lying on the floor. This will reduce the range of motion compared to the regular bench press because the elbows stop when they hit the floor.
You could argue that this might be a more optimal position to press from since there's no excessive arching of the spine. Everything is set in a more "neutral" position. If you have trouble with the regular bench press, but all is fine during the floor press, the proof in the pudding is right there.
Since the range of motion is reduced, and you don't get a stretch reflex from the chest and shoulders, your triceps will be the main movers.
The floor press is used so much in powerlifting systems, like Westside, because it decreases stress on the shoulders. And it's probably easier on your joints than the regular bench press.
A bar is fine, but dumbbells are more practical. Dumbbells also allow more freedom for the shoulders, and you can choose a more neutral grip if you need it.
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