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.
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.
