Use LIS2DH12 detect sit or stand

Hello everyone

We are designing a wearable device. It's worn on the waist. We want it can generate an interrupt when a man sit down or stand up, so that we can know a man is sitting or standing. It's a low-power device, wake up every 3 seconds.

Now, we are using the YLIE interrupt(assume the gravity is to -Y). But it's very easy to misjudge when walking or move body.

Can anyone give us some ​suggestion please?

Thank you.

LiBing

Best Regards