Not bad for 47, Madonna!

All those hours spent working out do more than just make her look good.

As these eyewatering poses show, Madonna has developed amazing flexibility and strength as well.

The 47-year-old mother of two bends over backwards (and ties herself up in knots) to demonstrate her gymnastic skills in the video for her latest single, Sorry. She also shows off backflips and somersaults in her most physical performance for some time.

'Madonna was cutting the most incredible shape across the dance floor,' said an onlooker. 'Some of her moves were gravity-defying, let alone age-defying. She was dancing solidly but didn't once look even remotely out of breath.

'She may be three years off her 50th birthday but she has the flexibility of a pre-pubescent gymnast.'

In the four-minute video, Madonna is squeezed into a white leotard and matching tassled corset as she performs in a cage. With her hair in a 1970's-inspired flicked style and a pair of knee-high silver platform boots, she looks a disco diva of the highest order.

The singer, whose album Confessions on a Dancefloor has been a critical and commercial hit, is certainly going through a leotard phase at the moment.

On Wednesday night she opened the American Grammy awards in a skin-tight lilac all-in-one.