As well as using it to motivate themselves, Dani and her course mates often use the locking in phrase light-heartedly.
Some days they all work on the same project in the same computer lab at uni. Telling a friend to lock in on what might well be a boring day often raises a smile.
“It has that element of connecting us all,” says Dani. “I’ve never actually realised, given how much we use it, that it’s slang.”
After her 10-hour day in labs a fortnight ago, Dani indulged her love of art – something she does to stop burning out.
“My friend and I were painting until 4am after our exam,” she tells me. They were locked in.