Watch TV Series The Rehearsal HBO Online free. Nathan Fielder returns to television for a new series that explores the lengths one man will go to reduce the uncertainties of everyday life. With a construction crew, a legion of actors, and seemingly unlimited resources, Fielder allows ordinary people to prepare for life’s biggest moments by “rehearsing” them in carefully crafted simulations of his own design. When a single misstep could shatter your entire world, why leave life to chance?