July 29-30, 2023 in the Leningrad region, a unique running event will be held — Biotropika.
The race will be held according to BACKYARD rules. The race is included in the Backyard Ultra calendar and will count toward the world standings of the series.

The BUT record belongs to Vasily Korytkin from Kemerovo — 46 laps (308.48 km)

Take part in BUT, try to set your personal record!

Register for BUT!