I was looking for a workout on YouTube, when this popped up as “recommended for you”. Although it is ‘old’, it was published in April 2021. There are some interesting discussions over technique and delivery from David Bryant, Tony Alcock, Andy Thompson, Ellen Falkner and and Amy Monkton. It’s done in sections, so you don’t have to watch all 1 hr 45 mins in one go. There maybe some ads when you start but they are short!