Office cubicles come in all shapes and sizes, much like the people hiding away behind them.

For some companies in Singapore, however, staff are starting to not only work in those cubicles but march around them, jump up and down and jog in them. And it's not a disease.

Personal trainer Brendan Goh, 30, has hit on the idea of getting office workers on their feet and putting them through a 10-minute workout he calls cubicle fitness.

If busy working people can't go to a workout, take a workout to them - that's the idea of Mr Goh's sideline.

Before he arrives, an e-mail goes out to everyone to be ready for him. He then takes his workout from one department to another.

And he makes sure no one gets out of the workout, no matter what their title. Company president and CEO of Singapore Computer Systems (SCS) Tan Tong Hai, 44, was laughing harder than anyone when he was told to lower his squat by Mr Goh, at their 9am workout a few Wednesdays ago.

Said Mr Tan, who encourages staff to leave work at 5pm every Thursday in order to exercise: 'If you won't go out to exercise, we will bring it to your cubicle.'

Cubicle fitness is nothing new, said Mr Goh, during a break in between 'torturing' staff. 'It is big in New Zealand and Australia. There is no need to change into workout gear because it is about sparking people's interest in activity, improving their alertness and getting them moving.'

Engaging 40 or 50 people in a department is not easy, he said, so he is usually with another personal trainer. One does the workout moves, while the other encourages the reluctant ones still sitting in their cubicles.

Mr Goh has eight companies signed up for his monthly office raids. More frequent sessions can be arranged if a company wants it.

He said: 'This is for people without gym memberships. If they can be encouraged to do 30 minutes of exercise in one day, then great. Do 20 minutes during office hours and 10 at home.'

He added: 'And they shouldn't wait for me to come once a month, but do stretches and a short workout together every day.'

Said 20-something Chua Ying Tze, SCS' marketing communications manager: 'The staff are excited about Brendan coming back. His first round was last month, and the feedback was that once a month is not enough.'

With 800 staff members in the building, that's a lot of people to get excited about exercise.

Mr Goh charges the company around $200 for the two instructors to spend two hours there but staff members do not have to pay a cent.

He said: 'I'm not selling the staff anything other than a feeling. It's motivational therapy.'

At SCS, he got everyone marching on the spot before they were exhorted to smile, clap their hands and jog on the spot.

As she swung her arms in the air, vice-president of group human capital management Lilian Tan sang out to her colleague in the finance department: 'You didn't process my claim!'

Aside from the energy in the room, there was a lot of laughter.

Mr Goh believes that such sessions leave everyone with a prolonged boost for the remainder of the morning.

He said: 'And there is no real disruption to work as only one department is working out, while the rest are working.'