Set-up: Find a pull-up bar and assume an underhand shoulder width grip.
Lift: Bracing through your core, lift yourself up until your chin is over the bar, trying to get as high as possible. Cue yourself to pull your chest to the bar to ensure full height. Descend all the way to full extension as this will engage more of the shoulder stabilizers and muscle mass of the back - this will help in maintaining health in the shoulder girdle.
Assists: Make sure you have a partner to help lift you up, or a chair to rest your feet on. Alternatively, if you have access to an assisted pull-up station, that is also a good choice. Resistance bands looped around a pull-up bar can also be used for assistance by placing your feet inside the band.