Hi James, happy to give you a bit more information. GFM is working on updating their website, and your feedback above will be helpful, thanks!
Basically, Ground Force Method (previously named Primal Move) is a comprehensive movement system, based on the framework of FMS corrective strategies (GFM is FMS’ first system partner), childhood development theory, and melded with bodyweight and floor movement flows (like Systema, Gynastica Natural, Brazilian JiuJitsu, yoga, etc.) - but it is NOT FMS... It is a ground based movement system, aimed to not only get people moving better, more integrated and strong, but to ENJOY the process. A lot of people have lost their enjoyment of movement and training due to injury, lack of mobility or ability, and/or pain. GFM's flows and games bring the childlike delight in movement back to the end user, and for that matter, the instructor/coach. What sets GFM apart from all the other ground based movement products, is that it is a cohesive system with FMS correctives built in to the movement patterns, as well as a neurological basis for seeing and building healthy movement - all programmed with games and movement flows to keep it fun and relatable.
If you are interested in bringing restorative and integrative movements that have progressions and regressions for any level of ability into your kettlebell or other strength coaching modality - then GFM should be in your tool kit not only as an instructor, but for your own athletic and goals. It is scaleable for any level, has understandable progressions and regressions, and if you are an FMS certified professional, when you screen your student/client, there is an additional road map from which to progress. We all know that correctives can be boring, and most of our students don't do their corrective exercises even if recommended by a clinician. GFM has a solution, there are corrective progressions that will help with changing FMS scores and the fundamental movement patterns. If your student/client has a 1/1 in the ASLR, there is a road map, and one that includes games and cool flows that make them feel like they are doing something 'ninja' like and fun, not just a boring corrective (though they definitely have their place for sure).
GFM is great for teams, group classes, kids, and adults of all ages, sizes, and abilities - and is easily integrated into any fitness, strength, or skill based training protocol. Especially for group exercise, GFM is particularly effective. We have what is called the GFE: Ground Force Exploration flow. It gives the instructor a very good look at the work capacity, the movement literacy, mobility and stability issues, and general strength of a group, during the warm up...in 6-8 minutes! This is particularly important for group programming because you never know what a day of sitting in traffic has wrought in your students when they come to 'workout'...this way you know if you need to prep more for squats, etc. We use this flow and GFM movements along with FMS and of course our foundation of SF strength principals at my kettlebell studio (Kettlebility) in Seattle with excellent results.
I hope that helps! Let me know if you have any other questions, happy to help.