I've had good success with the Upright GO. It's a little device that you stick on your upper back and connect to your phone via Bluetooth. It detects when you'

I've had good success with the Upright GO. It's a little device that you stick on your upper back and connect to your phone via Bluetooth. It detects when you're slouching and buzzes your back with a slight vibration to remind you to sit up straight. https://www.amazon.com/dp/B0747YHYZF/ https://www.amazon.com/dp/B0747YHYZF/