Take a look inside the Goldman Sachs gym, where membership works like a progressive tax

The Goldman Sachs office in London has all the amenities you'd expect of a five-star hotel.

There's a great cafe, a dry cleaners and even childcare.

One of the biggest perks is the office gym on the lower ground floor, decked out with the latest equipment.

While it's not unusual for investment banks to have gyms in the building, what is out of the ordinary is how Goldman charges employees for membership. The pricing structure works a bit like a progressive tax, with those who earn the most paying the most.

Analysts and associates pay around £30 ($43) a month for gym membership, which rises to £50 ($71.40) a month if they get promoted to vice president.

Once they reach the career heights of managing director, the cost rises to nearly £80 ($114.20) a month. Goldman employs 6,000 people at its London office on Fleet Street, near St Paul's Cathedral.

While membership at the highest level sounds expensive, you get a lot for your money.

Like elliptical machines with the latest breaking news:

And all the weights you could ever want: