What is the great lock in fitness trend and is it actually sustainable?

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  • Source: AOL
  • 09/24/2025

Challenges come and go in the blink of an eye on social media. It feels like yesterday that I was taking on the 75 soft challenge to find out if a fitness trend from TikTok might actually impact my life for the better. Since then, we’ve seen plenty of bizarre challenges go viral and then fade into obscurity.

Usually, these challenges fail to stick because they are simply unsustainable. Their virality is due in part to their extreme content and where the major tenets of health – sleep, movement and nutrition – are concerned, extremism is rarely enjoyable or good for the body. A more well-rounded approach applied over time with moderate, progressive overload is more likely to yield better results, which is why I raised an eyebrow when “the great lock in” started peppering my social media feeds.

This challenge is another fitness and wellbeing protocol created by influencers. It seems well meaning enough, though not all that fun if strict routines with no deviation tend to strike fear into your heart. Nonetheless, “the great lock in” does appear to be slightly more sustainable than the likes of 75 hard. In fact, it echoes many of the tips I’ve been handed by longevity experts over the years.

Fitness model photo-shoot 2025 by Joseph Kellner is licensed under Unsplash unsplash.com
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