It's Friday and my back hurts

I hope I will be fit enough tomorrow to go for a ride because tomorrow it will be a beautiful day, there will be about 20 degrees Celsius :)

General back saving tips:
 - take frequent breaks
 - get up and walk around every 30-60 minutes
 - lean back in your chair when you can
 - change position often
 - stretch your back frequently throughout the day
 - do warm-up stretches before lifting anything heavy
 - did I mention take frequent breaks? :D
 - the correct posture to be a nerd, and not to be a hunchback:

1. Elbow measure
First, begin by sitting comfortably as close as possible to your desk so that your upper arms are parallel to your spine. Rest your hands on your work surface (e.g. desktop, computer keyboard). If your elbows are not at a 90-degree angle, move your chair either up or down.

2. Thigh measure
Check that you can easily slide your fingers under your thigh at the leading edge of the chair. If it is too tight, you need to prop your feet up with an adjustable footrest. If you are unusually tall and there is more than a finger width between your thigh and the chair, you need to raise the desk/work surface so that you can raise your chair.

3. Calf measure
With your bottom against the chair back, try to pass your clenched fist between the back of your calf and the front of your chair. If you can’t do that easily, the chair is too deep. You will need to adjust the backrest forward, insert a low back support (such as a lumbar support cushion, a pillow or rolled up towel), or get a new office chair.

4. Low back support
Your bottom should be pressed against the back of your chair, and there should be a cushion that causes your lower back to arch slightly so that you don’t slump forward or slouch down in the chair as you tire. This low back support in the office chair is essential to minimize the load (strain) on your back. Never slump or slouch in the chair, as that places extra stress on the structures in the low back, and in particular on the lumbar discs.

5. Resting eye level
Close your eyes while sitting comfortably with your head facing forward. Slowly open your eyes. Your gaze should be aimed at the center of your computer screen. If your computer screen is higher or lower than your gaze, you need to either raise or lower it to reduce neck strain.

6. Armrest
Adjust the armrest of the office chair so that it just slightly lifts your arms at the shoulders. Use of an armrest on your office chair is important to take some of the strain off your neck and shoulders, and it should make you less likely to slouch forward in your chair.

Via rebuildyourback.com and seansoo.blogspot.com.