A gang caused criminal damage at Empire Gym in Market Deeping after trying to climb up a drainpipe and onto the roof.
The gym in Church Street was targeted between Friday, September 11 and the following morning when the suspects tried to climb up the front of the building to an area above the office.
Anyone with information should call 101.
Meanwhile in Bourne, two bicycles have been stolen from outside a house in Tarragon Way.
A women’s pink mountain bike with a broken bell and a purple men’s mountain bike were taken overnight between Wednesday and Thursday.
When calling 101, quote incident number 147 of September 17.