About 32 runners tackled a course in reverse to coincide with February 29 being an extra day in the calendar.
The latest round of competition in the Geoff Capes-run Lincs Throws Academy event took place on Sunday.
Photo gallery from the first of three competitions in the winter indoor shot put series at Bourne Leisure Centre.
An athletics legend's grandsons are taking the family name to new distances
UK's most capped male athlete gets Lifetime Achievement award
Bourne Grammar School logged their best-ever overall result in the regional round of the English Schools Cross Country Cup.
A record entry took part in the West Pinchbeck 10k road race sponsored by Robsons.
Holbeach youngster has enjoyed an impressive debut season.
Donovan Capes claimed the shot title representing Lincolnshire at the Northern Inter-Counties match at Hull.
Capes added the UK All Comers Championships gold medal to his English Schools title.
Double success for Bourne Academy student in the Eastern Young Athletes League at Ware