Enea Bydgoszcz Triathlon Pod Dachem is a winter indoor triathlon series held at the Astoria swimming pool in Bydgoszcz. It features six monthly races from November to April, using a supersprint format. This format offers a short, repeatable test before the outdoor triathlon season, rather than a long endurance event. The organizers present it as both enjoyable and a monthly fitness assessment, with participants completing at least three races qualifying for the overall series classification.
Each race begins with a 300-yard swim in the Astoria pool, followed by an 8 km cycling segment on stationary bikes with power measurement. The event concludes with a 3 km run along the boulevards next to the Brda River. Races are conducted in small waves of 20 participants each, with selectable start times available during series registration. The finish line is located near Astoria under an inflatable arch, and the race office is also nearby, keeping the entire event contained despite the outdoor run along the river.