Taking extra long breaks

Working in means another person will share the machine with you, and you will alternate sets. For example, you do your set of 10 reps on chest press, and when you are resting, a friend or fellow gym member will do their set, and vice versa. This works extremely well as a time saver when working out with a friend, or just as friendly gym etiquette with a stranger during busy gym hours. Working in is typically done on a machine that uses pins, versus a bar that takes weighted plates, as it is far easier and faster to change the weight between users with a pin loaded machine.