Yes, we have numerous clients who came to us with these injuries and have found relief by strengthening the muscles around the problem area. People often neglect exercising their lower back due to fear or re-injury and then end up weak, de-conditioned, and more susceptible to injury in the future. Every movement in CrossFit is scalable allowing you to take part. For example, if we have programmed deadlifts (picking an object off the ground) you can scale it down using a PVC pipe or just mimicking the movement for rehab.