Could you survive Spain¡¯s Indiana Jones-style boulder run?

Think Indiana Jones meets a Sanfermines bull run: you¡¯re in a small village in the mountains close to Madrid, rushing downhill through a series of narrow lanes packed with other adventure seekers, all pursued by a 200-kilogram polystyrene ball measuring three meters across.

Welcome to Matalpino, some 50 kilometers northwest of Madrid in the Guadarrama mountains, which has just celebrated the sixth year of its ¡°Boloencierro¡± (a word made up from bolo, for ball, and encierro, bull run).

In August 2011, as Spain struggled to deal with a worsening economic crisis, the local council discovered it lacked the funds to hold its annual fiestas, which traditionally included bullfighting and bull runs.

Anybody thinking that the ¡®boloencierro¡¯ might replace bull runs would be wrong, says Matalpino¡¯s mayor

But Mayor Javier de los Nietos of the Socialist Party (PSOE) had a bright idea: instead of bulls, the community of 1,700 people would invest in polystyrene boulders and take advantage of the town¡¯s up-and-down topography.

Since then, what started out as a homespun solution has put Matalpino on the global tourist map, attracting television stations from as far afield as Japan and China.

Earlier this year, the local council registered Boloencierro Matalpino as a trademark and now plans to export its brand around the world.

The Boloencierro Matalpino export version is for children, explains De los Nietos. It uses smaller, lighter boulders that are also irregular in shape, meaning that they bounce around more. The danger here isn¡¯t so much being squashed by a polystyrene rock, but tripping and ending up with scratches and scuffs. ¡°We recommend children wear long trousers and a long-sleeved shirt,¡± explains De los Nietos.

This summer some of the fiestas held in the mountain villages north of Madrid will feature the Boloencierro Matalpino: Torrelaguna (September 3), Cercedilla (September 10), Navacerrada (September 11), and Moralzarzal (October 1).

De los Nietos says he has been in talks with Pamplona, home of the Sanfermines fiestas in July, to include the Boloencierro at Sanferm¨ªn Txikito, a smaller fiesta with no bull runs that is held at the end of September in the old town of the city.

In Matalpino itself, the Boloencierro takes place over the course of the weekend of the first week of the fiestas, in mid-August. The children¡¯s version is staged first, using colored mini-boulders, followed by the adult event, which in years past has been repeated up to three times. This year, however, the second run ended halfway through when the boulder split in two halfway through the event.

Matalpino is now on the global tourist map, attracting television stations from as far afield as Japan and China

But anybody thinking that the boloencierro might replace bull runs would be wrong, says De los Nietos: ¡°It¡¯s not something that divides bullfighting aficionados from opponents: in fact it brings them both together; everybody enjoys the party.¡± In short, Matalpino continues to stage bull runs, holding one each evening and another two during the day over the course of the first weekend of its fiestas.

De los Nietos, who says that in his younger days he ran with the bulls, explains the Boloencierro: ¡°You feel very small, and you have to keep your wits about you, because if the boulder cracks you on the back, it can push you against the walls or onto the ground.¡± There have been cases of people being concussed.

¡°There tend to be more injuries in the Boloencierro than during the bull runs, I guess because people don¡¯t take the right precautions,¡± says the mayor. This year four people were injured trying to outrun the polystyrene boulder. Two of them ended up in hospital.

English version by Nick Lyne.