When presenting at a conference room table, don’t sit at the end of the table. Sit close to the middle. You can be heard better and work the room easier.
When it is your turn to present, sit on the edge of the chair, make sure the chair seat is as high as it will go, then lean in with your arms on the table. Don’t sit back until you are finished with your presentation and have answered every question.
Oh, and smile.