Fitness coach Joe Wicks, known to his millions of online followers as 'The Body Coach', set a new Guinness World Record on Wednesday, July 5, for the largest ever High-Intensity Interval Training (HIIT) session.
Thousands of people joined the session that was held during "Barclays presents British Summer Time", an annual concert series in London's Hyde Park.
HIIT consists of short bursts of intense activity followed by short periods of recovery and can blast calories, build muscle and boost endurance, fitness trainers say.
Wicks and the huge crowd, consisting of 3,804 people, beat the previous record by a little more than 100 people. They had to exercise continually for over 30 minutes.