First of all, there’s the tilting mechanism found on all entry-level chairs reserved for those on a budget. This type of mechanism tilts in the center of the seat (hence the name). This has several implications, for example, when you use it, your feet will inevitably lift off the floor. If you’re on a budget, it’s cool because it allows you to do all the basic tricks of a rocking mechanism. In other words, it distributes your body’s weight more evenly (so your muscles feel less strain), and lets you move more throughout the day. In short, you’ll tire less and put less pressure on the muscles that keep you sitting. As a result, for example, your lumbar vertebrae will be less fatigued, so in addition to the present support, you’ll have less trouble staying seated for longer. Because… Muscle fatigue means… A greater propensity to end up slumped over in your chair! However, xe isn’t as good as the off-center rocker mechanism (more on that later), but it’s still better than the permanent contact mechanism. In terms of playing time, it’ll do for around 3-4 hours. And here’s a little tip to help you recognize it in photos: Here’s a centered toggle, it looks like this (if you don’t get it, I suggest you compare it with the off-center toggle below, and it’ll ring a bell right away).