Watch stage 8 of the 2009 Tour de France for lessons in how to do it and how not to do it. You had a quartet off the front - Luís León Sánchez, Sandy Casar, Mikel Astarloza and Vladimir Efimkin.
Over the 40km run-in from the final climb to the finish, the four started relaying to maintain their advantage, but very soon Efimkin was shirking his turns. He just stayed at the back while the other three took turns, and managed to annoy the other break riders, who had words with him, shook their heads, tried to ease up to make him take the pace etc., but Efimkin would not be convinced. He eventually set off solo with a few kilometres to go, much to the annoyance of the others (Casar in particular), and they worked to bring him back. Luís León Sánchez took a few relays, but fewer than Casar and Astarloza. His shoulders were rolling, he was gurning like crazy, clearly suffering, but he was taking turns when he was able - it just wasn't as often as the other two, who were fresher. Casar and Astarloza didn't remonstrate with Luísle, because he was clearly TRYING to help, he just didn't have it.
Then they caught Efimkin, and Sánchez dashed away for the stage win, because he'd been bluffing.