Laura Muir is flying. Definition - flying [ˈflaɪɪŋ] adj 1. (prenominal) hurried; fleeting: fast action; moving or passing quickly on or as if on wings. athletics jargon; being on top form.  

This report, hot off the Scottish Athletics Site.

...Laura completed a golden weekend in astonishing fashion at the Scottish National Senior Indoor championships in Glasgow when she 'smashed' a 30 year old Scottish junior record in the process as she claimed the 800 metres senior women’s title.   Muir, remarkably, had won the scottishathletics Under-20 women’s cross country title at Falkirk the previous day.  Vet student Laura triumphed over 4.8k at Callendar Park and then proved her versatility to hold off Kathryn Evans in Glasgow and take a junior record set in Cosford in February 1982 by Linsey Macdonald. Muir ran 2:08:12 at the Kelvin Hall with Macdonald’s 2:08:40 having stood as the best Scottish junior mark indoors since February 20 1982.  ‘It is a thrill to win the senior women’s 800 and also to take that record,’ grinned Muir later. ‘That was a bit of a target but I didn’t actually decide to take part at Kelvin Hall until after the cross country at Falkirk. ‘I was entered, of course, but we thought it best to wait and see how I felt later on Saturday. I am glad we came along here now!  ‘It has been a great weekend for me but it was a tough race because Kathryn was right on my shoulder for the last two laps. I should thank her for helping me set that time.’