Planks! Planks are of the devil. :) Deadlifts! Which, is you don't have a barbell, can be done with dumbbells or kettlebells or really heavy boxes. Squats. Keep good form on the squats, and lift heavy things, and your back cannot help but get stronger. Bridges. Convict Conditioning (which is a book) has a great section on the progressive bridge, and how you can get a back like steel cables using just your own body.
In fact, if you buy Convict Conditioning, you get probably the best body-weight-only progressive exercise system out there.
If you want to buy a second book, and you have access to a gym with barbells, I also highly recommend Starting Strength.
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Deadlifts! Which, is you don't have a barbell, can be done with dumbbells or kettlebells or really heavy boxes.
Squats. Keep good form on the squats, and lift heavy things, and your back cannot help but get stronger.
Bridges. Convict Conditioning (which is a book) has a great section on the progressive bridge, and how you can get a back like steel cables using just your own body.
In fact, if you buy Convict Conditioning, you get probably the best body-weight-only progressive exercise system out there.
If you want to buy a second book, and you have access to a gym with barbells, I also highly recommend Starting Strength.