The Forest Cup, honoring Tomasz Hopfer, is an open international cross-country race held in Obliwice, a village within Gmina Nowa Wieś Lęborska in Lębork County. Participants run 6.4 km. The event carries a local nickname with significant backing: Obliwice styles itself the World Capital of Cross-Country Running. The Tomasz Hopfer Ecological and Sports Foundation organizes the race, which focuses on forest trails instead of an urban road circuit.
The race also serves as a qualifier for the International Mile Race, commemorating Piotr Gładki. The top ten finishers secure a spot in that subsequent competition. The event welcomes a diverse group of participants, including local residents, visiting athletes, children, accomplished runners, and families, all competing within the same program. Following the race, Obliwice hosts a picnic with related activities. In Lębork County, running is viewed by many as a healthy pursuit and a way to relax, aligning with the event's blend of competition, community spirit, and traditional local sports festivities.