Stand in the middle of the floor, reach down, grasp your shoelaces (straps, buckles, or whatever else is holding your shoes on), and see how far off the floor you can lift yourself.Try it three times.

• 站在地板中间，弯下身抓著你的鞋带(扣环或其他固定鞋子的东西)，然后看看能够把自己举起来，离开地面有多远，如此试三次。