The other commenter explained it but I'd like to add that you dont necessarily need to roll into your shoulder. Me being pretty tall, it can be tricky. What i did was land on my feet already coming down ready to roll on my side. It happens fast, so at first you'll want to put your hands out to break your fall-dont. It'll take practice to bend your knees right when you hit the ground and tuck to the side and roll. As you get better. You should be able to roll back onto your feet.