I recommend a simple method: lie on the bed before going to bed every day, stretch your arms forward, then push your arms and legs up to the limit position with your hands and feet at the same time, hold them down and then put them down. Repeat several times according to your physical strength. If you persist every day, you will obviously feel the effect after one month. The phenomenon of backache will be improved. It is better to stick to it for a long time.

If in doubt, please ask.