My 5yo can do an entire set, including the ones with different heights. He has just mastered it in the past 6 months.
I remember that the monkey bar set was a "required" skill in my Kindergarten PE class if you wanted to pass. I remember it being a real struggle, and I wasn't the only one who had trouble with it. Ugh. Bad memories :P
Doula, student midwife, and homeschooling mom to 4