If you are sitting all day, you need to stretch and strengthen your back muscles. You don't just have to do resistance training with weights to do this, but it is recommended to add that to your routine. You can also strengthen the back with isometric contractions (yoga positions like plank), but also with other core stability training. If you would like to learn more about this type of training and exercises to do, contact your personal fitness trainer and let them know what you are looking for.
Thanks,Kisar DhillonThe Portland Personal Trainer
The Art of Personal Training by Kisar Dhillon107 SE Washington Street, Suite 137Portland, Oregon 97214(503) 953-0241