According to Official Guinness Records,
The most double leg circle rotations on a mushroom trainer in one minute is 68 and was achieved by Parker Lupher (USA) at Incline Gymnastics Company, Highland Ranch, Colorado, USA, on 23 August 2017. Parker was only 10 years old when he made his record-breaking attempt.
For a complete list of 2017 records, please visit 2017 Guinness Records in United States.