It's not exciting. I have crazy lower back problems and my desk time is limited. I work from home full time. I found that with long PC gaming sessions my posture goes to total shit.
Set up a gopro on yourself, put it on time lapse mode, and see what you do doing long gaming sessions.
Anyways. Mainly I have reduced my desk time down to 2 hours a day. The rest is lounge chairs, bean bags, bed, etc. PC gaming had to go, because I've yet to see a good way to use a keyboard/mouse while playing on the TV. And no, a TV tray isn't a good solution.