Sitting sensor recommendation

I am currently doing a project that requires to detect where the user is sitting or not,
what will be a suitable sensor that can hold a normal adults weight,
It doesn’t need to be accurate measurement, more as a trigger.

Hi Tzul,

A few options come to mind, if you run a search on the site you can find a few different options for weight sensors. An LED/LDR combo could also work as a trigger?