I just tried sitting up straight in my comp chair for 5 minutes because preventing back problems in the future is the new rad thing to do. My neck and shoulders hurt like hell. It's super uncomfortable. I'm probably just not used to it, but I didn't think it'd be this bad. Usually I'm slouched over and sitting cross-legged on the chair with my neck lowered. It's like I'm meditating with my eyes open and I often achieve nirvana like this.

How does everyone sit? Do you normally sit up straight? If not, is it really uncomfortable to do so?