Staff at a city company are having their working week cut by a day but with no loss of pay or benefits.
Pursuit Marketing hopes the move will improve the work life balance for their employees as well as boost recruitment.
The firm believes it is one of the first firms in its sector to introduce the measure in the UK.
Amazon recently announced it was trialling a four day week for some staff but under its scheme, employees will also have their salaries cut accordingly.
Pursuit, which specialises in generating sales leads for a wide range of businesses, is creating a further 35 telemarketing jobs to meet growing demand.
Staff get free gym sessions, access to a wellness coach, personal trainers, massage therapists, a running club and nutrition advice and flexible working is available for parents.
Operations director Lorraine Gray said: "After actively encouraging flexible working, our new four day working week is the next logical step in helping our employees achieve a positive work life balance.
"It also recognises that in today's competitive marketplace, attracting and retaining the best staff isn't always about pounds and pence.
"We are not asking people to work our traditional 37 hour week in four days. If people want to come in and work on a Friday because their priority is to earn more bonus then the office is open and they are welcome to join in but this is entirely voluntary.
"As far as we are concerned, our sales team's working week is Monday to Thursday. Friday is for doing the things that give them enjoyment."
Colin Borland, senior head of external affairs at the Federation of Small Businesses said: "Smaller firms can often be more flexible than their larger counterparts and offer their employees more tailored working conditions while still getting the job done.
"Although not every business or sector will be able to follow Pursuit Marketing's approach, it is always great to see innovation within the small business community here in Scotland."