I. IntroductionThe wall pull-up is a variant of the pull-up suitable for beginners or those with less strength. Compared with the traditional horizontal bar pull-up, it uses the auxiliary force of the wall to reduce the difficulty of the movement, so that more people can participate in and enjoy the

1. Whether it is wired or not, the traditional wired vacuum cleaner usually carries a garbage storage bin, which is relatively bulky and plugged in. When changing rooms, you need to change the plug and drag it to scratch the floor. In addition, ceilings and chandeliers are too high to be cleaned. Th