Aside from the troll content here, you do have to be careful if you have e.g. spinal issues. Nerve damage can make even light exercise excruciating. I had to

Aside from the troll content here, you do have to be careful if you have e.g. spinal issues. Nerve damage can make even light exercise excruciating. I had to build back up carefully, never hyperextending, always keeping good posture, using light or (usually) no weight, focusing on weakened muscle groups, and never going to exhaustion, all of which is rather boring but was completely necessary. I do find that regular exercise helps with my neck and back pain, but it is certainly not a cure-all, and I worked out regularly before the pain started and definitely cannot do that type of workout any more. I've put back on about 15 pounds of muscle mass, but it's taken over a year of diligent work. On the plus side, my muscle tone is much better than it ever was from previous workout routines.