X Im!possible
Race Info
Event overview
Date: 18 April 2025
Location: Albisgütli, Zürich
Start time: 12.00
Format: Backyard Ultra
Time limit: open ended – the race continues until one runner complete a loop
Everesting Challenge
The X Im!possible Backyard Ultra is not only one of the toughest Backyards ever designed — it is also a direct path into the Everesting Hall of Fame.
With ~380 m of elevation gain per loop, runners accumulate vertical meters incredibly fast:
6 loops: 1/4 Everesting
12 loops: Basecamp Everesting
24 loops (100 miles): Full Everesting
All vertical gain counts toward official Everesting achievements, making this event uniquely suited for runners aiming to combine the Backyard format with a high-elevation challenge.
Official Recognition
X Im!possible is officially registered with Big’s Backyard Ultra and listed on DUV.
Aid & logistics
Aid station, food setup and logistics at the race base are currently being finalized.
Details about food, personal area, drop bags, facilities and crew support will be published soon.
Awards & Runner Gifts
Although the Backyard format crowns only one official winner, we want every participant to take home something memorable. There will be a prize for the Last One Standing, special gifts for all runners who DNF, and every participant will receive the official event T-shirt. More details about awards and gifts will be announced closer to race day.
