Make time to check your bag/briefcase each day for items you wont need. Additional weight in your bag is extra weight that your shoulders and back have to bear.
Use a rucksack design laptop case, carry it on both shoulders and adjust the straps so that the bag is close to your back.
Take the time to adjust your chair when you start working at a new location.
Your seat should be adjusted so that your feet are flat on the ground, your hips slightly higher than your knees and your eyes level with the computer screen.
Relax when sitting into your chair, making sure you have your bottom against the seat back and your shoulder blades are touching the back rest of the chair.
Arms should be flat and your elbows level with the table or desk you are using. Use a seat with arm rests.
Take regular breaks. Never sit at your desk for longer than 40 minutes; less if possible. When you take a break, walk around and stretch a little.
