If you want to impress someone with a ‘feat of strength’ but haven’t been putting in the training, then head to the commune of Huelgoat in France and get someone to film you pushing the 137-tonne ‘Trembling Rock’ around.

Yes, we said 137 tonnes.

The Trembling Rock is so named because if you push it in the right place, it teeters back and forth – or ‘trembles’, as various amazing video clips show (if you look closely).

To bould-ly go: Pictured is the 137-tonne ‘Trembling Rock’ in the commune of Huelgoat in France, so named because if you push it in the right place, it teeters back and forth

One Video shows a man successfully moving the rock by simply pressing his back against one end

The enormous granite boulder has been drawing tourists to Huelgoat Forest for years.

One video shows a man successfully moving the rock, which measures seven metres (22ft) in length, by simply pressing his back against one end.

Other videos demonstrate the strange phenomenon more clearly – in a second clip, the boulder is seen bobbing up and down with ease, despite its tremendous weight.

How is this possible? Dr Mark Whalley from the London-based Institute of Physics (IOP) told MailOnline Travel that it’s possible that the ‘Trembling Rock’ may be a ‘beautiful example’ of the ‘principle of moments’.

A statement from the IOP explains: ‘Assuming that the rock rests on a relatively small area, you could think of it in two parts. Half is on the left-hand side of the pivot point, and half is on the right.

Dr Mark Whalley from the Institute of Physics (IOP) told MailOnline Travel that it’s possible the ‘Trembling Rock’ may be a ‘beautiful example’ of the ‘principle of moments’

A statement from the IOP explains: ‘It is possible that the Trembling Rock is a 137-ton granite see-saw.’ Picture courtesy of Creative Commons

The enormous granite boulder has been drawing tourists to Huelgoat Forest for years

‘Each side is effectively pulling down, wanting to turn the rock in that direction. The mass on either side of this pivot is distributed in such a way though, that the clockwise turning effect balances the anti-clockwise turning effect.

‘This is what we experience on a see-saw. Two people can sit [on] either end of a see-saw and it is perfectly balanced. It only takes a slight push to make the whole thing move one way or the other though. So, it is possible that the Trembling Rock is a 137-ton granite see-saw.’

However, according to the IOP, the rock would need to be examined in order to be conclusive about what makes it ‘tremble’. ‘Without visiting the site and having the opportunity to test out various ideas, it’s not really possible to answer this question conclusively,’ the statement adds.

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