For a really in depth answer read the article by Martin Levine on the Quora app. I used the following link
Jill O
North Yorks, United Kingdom
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Commented on 21 of 65 Seven Summit Step Challenge (Mt. Kilimanjaro) Beginner Sweaty Step Aerobics Jenny Ford
29 Jul 02:19
Loving these "older" workouts. Almost third of the way throught thr programme now. Very enjoyable and love Sophie's appearances and interactions