The symptoms of delayed gastric emptying include nausea and vomiting. Poor emptying of the stomach can occur for several reasons: The outlet of the stomach (the pylorus and duodenum) may be obstructed by an ulcer or tumor, or by something large and indigestible that was swallowed.
Heavy pulldowns build up your lats, biceps, and forearms, which are the exact muscles and range of motion needed to do a pullup, Duffy says. We recommend working the following: Weeks 1, 2, and 4, perform 3-5 sets of 4-6 reps with heavy weight, for Weeks 3, 5, and 6 perform 3-5 sets of 10-15 reps with lighter weight.
Most people don't do them at the gym because most people can't even do pullups. A weight vest is quite expensive though, get a belt and just add plates to get the weight up. To harp on this point: only 10% can do a pull-up and only 1% can do 10 or more. The people doing weighted pull-ups are the 1%, quite literally.