Origin Fitness secured the six-figure deal after a competitive tender process and will begin the job this month.
Sales director Jonny Curley said: "We did the refit of the Royal Bank of Scotland gym at their headquarters on behalf of Nuffield.
"Since then we have done six jobs for Nuffield and as they work with Google we tendered for the contract and won it. It's a really exciting one for us. Google even phoned us up to congratulate us then asked if they could spend an hour helping with our website."
It rounds off a successful few weeks for the business, based at Newbridge on the outskirts of Edinburgh, as it also sealed a five-year agreement with Renfrewshire Council to refurbish nine leisure centres. This contract could be worth £2 million.
Mr Curley said: "With the Renfrewshire deal we feel that is us now competing on the really big contracts.
"In the past we have done work for other councils on a case by case basis. Some of the bigger councils still seem to want to work with the bigger English companies, but we are trying to break that barrier."
The directors are predicting a £4m turnover for the current financial year to the end of March, double the £2m pulled in during 2010/11, with that rising to more than £6m in the following 12 months.
Staff numbers are also expected to rise from 30 to 50 as the business, which acquired fitness maintenance company Cardinal Sports last year, expands into Ireland and other export markets.
Mr Curley added: "We have a fundamental belief we will only grow the business through good service and the only way to control that is have our own people.
"With Ireland we have been appointed by Star Trac as their agent after trebling their sales in Scotland. We have one person over there at the moment but are considering opening up an office."
As well as supplying gyms and other equipment sellers, Origin Fitness has it's own gym facility in Cupar, Fife.
Directors Paul Bodger and Josh Bicknell set up the business in 2009 with Mr Curley joining in January 2010.
Source: Herald Newspaper, Tuesday 10th January 2012.