From the comments read here I can manual mtb or BMX longer than all of you.
Haven’t ever thought about how long it took to learn. Sorry. It was a long time ago. and I was just having fun. I manual every ride. I still ride almost every day.
What I can’t do is hold a manual using my rear brake to hold the balance point as many mtbers do. I learned manuals brakeless. it makes long downhill manuals end up very high speed.
Wobbliscott- You don’t actually need to use that “L” shape at all to initiate a manual and hold it. I never have. ever. all that’s required is a push/kick forwards with the legs through the thighs while simultaneously hanging back from your bars.
The “L” shaped advice seems like it has been added by skills tutors in order to find a repeatable teachable technique which forces you to push your legs while moving your weight backwards. This does not mean it’s the only correct technique.
most mtb riders are not dynamic enough on their bikes and do not have strong enough muscles to manual comfortably when learning.
Plenty mtb skills coaches can’t manual very well at all.
Ask for a refund if you ever find yourself on a course with one who can’t.
Seriously. (it’s a basic skill).