The books like the Rookie Coach's guide and Level 1-4 PDP are ok. Honestly, more hands on training outside of just shadowing is more useful when training coaches. Shadowing will show them how to use what they have been taught. I've been having this argument with my current owner, but hopefully you understand. You can never coach your rec/kinder and beginning coaches enough because this is where you make or break your gym. I see too many gyms that don't put the time in or put " enough " time in and get marginal results. Sometimes they think they are fine when they really aren't.
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I like the GymCert manuals and would find it useful to have for beginning coaches to peruse. It's also nice to have a video collection and like most of the stuff from Fun and Fit even if I don't agree with their curricula for rec ( but this mostly stems that it doesn't seem to work in competition gyms as the kids are not in the gym long enough before you put them into some developmental/competitive program ).
I'd print out a lot of the articles from USAG and what not and perhaps keep them in a plastic covered binder.
Drills and Skills is interesting from Bill Sands. Not neccessarily what you'll need for them.
I'll plug my friend the gymnasticsman.com for good training needs for preschool and recreational gymnastics. He comes from a gym that is very orientated towards that niche and that gym has 3 gyms in the Sac area that are all 1k+ ( with dance and other programs ). Huge kinder and rec ( see Trick's Gymnastics in Sacramento ) programs, probably bigger than Byer's and Technique Gymnastics in Sac ( and Technique is a 44k ft gym ).
His " the Big Book of Gymnastics Games " is awesome for skills in kinder or rec. Getting the Rookie Coach's guide and having the Safety Cert manual is a good idea as well. This will show basic planning and where to spot when setting up their circuits ( pretty much how kinder is run ). Matt also has a video that really shows how this works. Rookie coaches can really get into video in a group setting more than just books too. Maybe, it's just this day and age and because we are so visual nowadays.
This is pretty good too:
Gymnastics Stuff Karen has a lot of short manuals on skills as well. Good to have around for those rec levels past age 6.