January isn’t the only time for new year’s resolutions anymore. The end of the year is having a moment too - as part of the great lock-in trend. There’s lots of content online about locking in for the last four months of the year - whether that’s working out more regularly, spending less time on your phone, or trying to get that promotion at work.

Some people call it a winter arc, a September reset or the fresh-start effect - why have so many of us decided this is the perfect time for self-improvement? And is striving for optimisation all the time necessarily a good thing?

We hear from Adeja Shivonne, a lifestyle content creator based in New York City, who shares how her great lock-in is going. And BBC journalist Melissa Hogenboom explains what the science says about how to successfully set new goals - and stick to them.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams and Chelsea Coates Video Producer: Tim Hodges Editor: Emily Horler

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