Climbing "Hekal" (Grade 6) in "U srdíčka" is a memorable experience. The route likely presents a mix of challenging moves, demanding technique and a good level of strength. "U srdíčka" is known for its sometimes-polished rock and tricky cruxes, so expect good footwork to be essential. Grade 6 in that area suggests you'll be encountering overhangs, crimps, and potentially some pumpy sections. Prepare to be challenged and rewarded with a satisfying climb!