When a player jumps from a tall height he will roll?

Is it possible to make it so when a player jumps or falls from a high height he/she will roll when landing the ground.

What I mean by this is a have a rolling animation, so can you make it so it only runs the animation when he falls from a certain stud count. Say 20 or 15, but I dont knowif there is a function for falling. Id probably have to make my own function or variable.

But is there anyway?

Thanks for your time.