Using a Canine leash or a dip belt, wrap across the dumbbell, hold it on the hips, jump up over the bar. Even much easier is to put the dumbbell on the ground, step up on to it and seize the pullup bar with your hands. Then seize the dumbbell https://shanevvuso.isblog.net/hammer-strength-dumbbells-can-be-fun-for-anyone-50469917