“Beginner Gains” aren’t a one-time phenomenon - it’s a process that happens whenever you start practicing a skill or exercise your body is unfamiliar with or change up your training programming. Hitting plateaus generally happen when people meet their body’s natural point of diminishing returns or when they’ve exhausted whatever program they’re using that wasn’t necessarily made for longterm progress. Diminishing returns will happen to everyone. Although the progress will not be as dramatic as what you see during the beginner gains period, the most reliable way to keep growing is putting in more time and effort working out.