Some Japanese firefighters start a training called ‘Human ladder’. (I want to name it ‘Ninja’) This training is required teamwork. In this training you have to climb a wall without a ladder or any tools. ... What do you use to achieve the goal? You need to rely on your crew and to ask him to be a ‘step’. You can climb the wall with his back, shoulders, hands… When you think the step is your crew, you’ll care the crew (the step). When you play a role as a step, you are required strength and endurance. You’ll notice that you have to corporate with each other in order to accomplish the goal through this training. http://youtu.be/SVBsi0B9QUw