It may appear a bit stupid to think again about where exactly to sit on a chair while giving a sit-down presentation, however it could have an impact on how you will come across during the presentation.
During a sit-down presentation where you have to present something, try to sit a bit towards to front of your seat. Sitting at the front (first half) of your seat will give a more active seating position. If you sit at the back of a seat you are tended to sit back / relax and therefore don’t come across as too active while presenting.