10. Auto mechanics. They work in physically awkward positions all day long bending over cars, sliding under cars, etc. Having to look "up and back" at the underside of the cars causes neck problems, as well.
9. Nursing home workers have to lift elderly people into and out of bed. The workers' bodies can become twisted off center. Sometimes the seniors make sudden movements, which can result in workers' unexpected injuries.
8. Delivery drivers are always running, often carrying heavy and awkward packages. Packages shipped via UPS, FedEx, etc., have increased in weight over the years. The job also involves a lot of driving, which is rough on the back.
7. Firefighters/EMTs. When they have a job to do, the conditions are extreme. They have to deal with fire and the water pressure from hoses and chop obstacles down with an axe to get closer to the fire. They often have to carry people to safely, which is particularly difficult if the victim is obese or incapacitated.
6. Shingle roofers. The worker's body is always at angle, twisted, or in some other awkward position.
5. Farmers lift heavy equipment and bags of feed and grain. When doing fieldwork, they have to constantly turn backwards to watch