AS the title says, I am trying to learn box squats. For now, I am just using a bench as the gym does not have any boxes, but I should get a regular box soon. So basically, I am doing high box squats for now.
Anyway, I watched a lot of videos and diagrams of box squatting, but they mostly show them from front or back angle. Everyone is stressing the position of the shins but it is little unclear to me what position my back should be in. For example this article says the back should be just like during regular low bar squats (www.dieselcrew.com/how-to-squat - scroll down the page), but other articles and videos claim the back should be as straight as possible.
Here is a video of my doing box squats. It shows it from 3 different angles, so hopefully you will be able to see what my form looks like and help me improve it.