A lot of people look to specific areas of the body that they find the most appealing or the most useful when it comes to sports or just everyday life. Some people look arms as a mighty thing because from the fingers to the shoulders they have the ability to build things, lift heavy weights, bend metal, carry another human to safety, knock out another person or hit a baseball far into the stands. Others like to look at legs as amazing and they are; they give you the ability to run very fast, have the power to kill a person with a single kick to the head, run hard for a touchdown, the agility to steal second base and be able to go for long periods of time in a boxing or wrestling ring. These are all good qualities and various body parts are appealing and all but nothing takes the place of the spinal cord.
The back is the second largest set of muscles next to the legs and for good reason. The spinal cord however are the bones that connect everything together and if one little bad thing goes wrong and one or more set of bones no longer function and broken, you wouldn't have great legs or powerful arms anymore. You would be paralyzed and it could end your life as a healthy individual as you know it.
Its very difficult to come back from spinal injuries and the majority of those that are crippled from a spinal injury don't ever come back and it becomes a painful and stressful life that nobody could ever live with. Look at guys like Christopher Reeve, Darren Drozdov (Puke from the WWE's Attitude Era), Roy Campenella, Issac Redman (Former Pitts Steeler) and others that live or lived with Spinal Injuries that has living in a wheelchair for the rest of their lives. We can't always control what's going to happen in the blink of an eye but we can damn sure control how we train our bodies that has potential to severely reduce injury. Here's one example of this; Brock Lesnar in his match against Kurt Angle for WWE Title at Wrestlemania 19 at the very end, does a backflip off the top rope and accidentally lands on his forehead; BTW this guy is 6'3 285 lbs. of pure solid muscle and was lucky his life didn't end right there because the average wouldn't just be paralyzed, he'd be in the damn morgue. What saved his life and a possible life threatening injury was the strength his neck and spine. All those hours from doing Neck Bridges and moving in every possible direction to build solid power in his neck made that much of a difference and that move was only if at all 2-3 seconds long. Think about that, his whole could've been over without any chance of recovering in that single moment and he came out of it just on a CONCUSSION!!!
The best thing you can do in your training is to strengthen the spine and the neck that literally can save you a hospital visit and save you hundreds of thousands in hospital bills and the cost of medical supplies to keep you alive. I train my neck and spine just about every single day for the sole purpose of staying injury-free and possibly keep me from being aggressively injured and not able to use my bodily functions again. That's why I consider Advanced Bridging to be the number one course for building a healthy spine and a super strong neck. Don't let the title fool you, it has stuff for beginners too and teaches you everything you need to know on how to handle yourself in various bridges, specific skills and in full detail take you through exercises that build an amazing level of capacity from your neck all the way down to your feet. Because of using this course I have never had injuries to my spine and have never broken my neck or even pinched it to where it was unbearable. Save your own life by training your body in ways many consider to be dangerous and to the extreme.