Nowadays backtraining has almost become an obligation to do because of sedentary jobs! These one-sided jobs and exercises cause imbalances in abdominal- and backmuscles, that are able to be balanced by selective training. Abdominal- or backtrainers should always be adjusted on both muscle-groups, they're both responsible for a healthy back.
In addition the consistent abdominal- and backtraining has also aestetic sequels. Don't we all want a smooth waist and a good bearing? Beer belly and humpback are definitly out!
- ergonomically optimized body position - prevention of hollow back forming - optimal results of the stomach- and back-training - weitghts and bars are not in scope of delivery