Hey,
Just came across this post. I’m a current PT and work in the outpatient setting among others. I also have had a fair amount of foot and ankle injuries in my past. Also for reference, I wear barefoot shoes about 90% of the time including the Vivo trackers while hunting.
When we consider the foot there’s 20+ muscles just across the top of your foot that are called the intrinsic muscles. They control motion, proprioceptive feedback to the brain about where your foot is in space and the position it is in, and more. This is important for stability when walking on uneven terrain, especially in less structured footwear. The ankle is the first reaction source for balance when we become unstable, then the knee, then the hip, then we take a step to recover if necessary. These intrinsic muscles and the arch are the two most important places to strengthen and train for stability, balance and protection against injuries. The picture attached is not my own or original, but it is the activities I use to train my own feet and ankles, as well as give to my patients. A lot of these are in the video posted above which shows a pretty dang good progression of exercises low to high load and intensity.
It sounds like you’re in a good place to transition if you’re coming from less stiff shoes, that are already zero drop. The one issue you’ll likely notice the most strain is coming from a Birk cork sole that have relatively stiff arch support into the Vivos that have legitimately no arch. This is where you’ll want to slowly transition if you haven’t already to control the increased strain on the plantar fascia to prevent the ever increasingly popular plantar fasciitis.
Feel free to ask any questions or let me know if you want more details.
Happy bare footing!