The sweeper trees

Here there are two beams, one after another with a platform between the two. Rotating over each beam are two giant double-ended Sweeper arms. One is shorter than the other, and positioned above the second longer arm. There is an also an extra set of arms right at the start of the second beam. There are three in this set - two long arms, one above the other, and then a shorter arm right at the bottom. The contestants need to cross both beams by avoiding, jumping over and ducking under, the arms so they don't get knocked off. 
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