As usual, we try to fix a modern problem by throwing technology at it. There's a much simpler solution:
- Sit on the floor -
Sitting on a flat space on the floor, with no back support, forces you to use your own muscles (remember those?) to support your back, thereby making it stronger. For people not used to sitting this way, it is difficult to maintain one position for very long, so you wind up moving around a lot. Getting up and down from the floor without any external aids also builds muscles, while aiding flexibility.
It's pretty cheap too, as you probably already own the basic equipment.
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As usual, we try to fix a modern problem by throwing technology at it. There's a much simpler solution: - Sit on the floor - Sitting on a flat space on the floor, with no back support, forces you to use your own muscles (remember those?) to support your back, thereby making it stronger. For people not used to sitting this way, it is difficult to maintain one position for very long, so you wind up moving around a lot. Getting up and down from the floor without any external aids also builds muscles, while aiding flexibility. It's pretty cheap too, as you probably already own the basic equipment.