I am an in home care provider for the elderly. Recently my job required me to sit next to my client for several hours, to be sure they did not fall out of bed. A couple of times I repositioned my client by helping them scoot further up to the head of the bed. I have been experiencing lower back pain and also just noticed today that I actually have small bruises on either side of my lower back. Could this have been caused by the prolonged sitting, and/or poor body mechanics when I helped to reposition them?