Russian bar
The Russian bar is a circus act which combines the gymnastic skills of the balance beam, the rebound tempo skills of trampoline, and the swing handstand skills of the uneven bars and the parallel bars. The bar itself is a flexible vaulting pole around 4 to 4.5 metres long, typically made of fiberglass; three vaulting poles may also be fastened together to create a flexible beam. The act involves two bases balancing the bar on their shoulders, and one flyer standing on the bar, with the flyer bouncing and performing aerial tricks and landing on the bar.
Read article on Wikipedia