Weighted Typewriter Pull-Up

Pull up until your chin clears the bar, then stay up there. Shift your whole body sideways toward one hand, straightening that arm while the other bends further to take the load, then slide back across to the other side before lowering. Keep your chin above the bar for the full sideways travel in both directions -- coming down and back up between sides isn't the movement. The added weight makes the straight-arm side noticeably harder to hold up, so keep your core tight to stop yourself from swinging as you travel.