Three members of the Spalding Kickers Taekwondo Club passed their black belt gradings at the first time of asking.
Demetri Greenfield and Thomas Holland passed their first Dan with Kate Richardson passing her second Dan.
This was the 100th black belt promotion grading held at Mansfield by the British Taekwondo Control Board.
Nearly 300 students attended the historical event, the biggest turnout to date.
Club intructor Antony Temple said: “Years of preparation all came together on the day and the whole club is delighted.”
The club offers two free taster sessions and has students between the ages of six and 70.
They train at Castle Sports on Fridays from 7.30-8.45pm and Sundays from 10.30am to noon.
For further information call 01775 760190 or e-mail email@example.com.