 This is a simple experiment you must do. All of you who are sitting now on the floor, when you get up, you must use only two limbs to stand up. All of you, in your life, you must keep this of however old you are. This is a simple test for you. You sit down, cross-legged, and when you want to stand up, you use only two limbs. That means you don't do four-wheel drive, just get up with your legs. This much fitness, at least you must manage. If you can't climb a tree, it's okay, but at least you must be able to stand up. This much fitness you must maintain.