Last year, Thomas Frischknecht and Thomas Giger set a new, unofficial world record in Davos. They rode 13,572 meters downhill on their mountain bikes and never rode the same trail twice. "We can do that too," say the twins Anita and Carolin Gehrig and travel to Latsch in the South Tyrol to try and break this record.

Swiss television channel SRF has included their challenge to beat the record of 15,000 meters downhill in the SRF Summer Challenge series. The Twins' challenge will be broadcast tomorrow, Tuesday, September 23, at 11.15 pm on SRF zwei, or on the SRF player.www.srf.ch/sommerchallenge