Hii! The green bar is stamina(energy), but it doesn’t decrease the actual energy(the energy you get with the carrots)(hope that makes sense) and it starts going down when you do anything extended, collected or the passage and piaffe. It doesn’t decrease in anything working, so if you see the horse slowing down you can go back to working trot, walk or canter(or fully stop)(but when the stamina is super super low it won’t let you canter) and you can stay in any of these gaits until the green bar disappears. The higher the stamina stat is the longer you can do the extended, collected, passage and piaffe and you can train it by sending the horse to train(make sure the chance of success is fully pink (the higher the stats are the bigger chance of success there is)). So yeah hope this helps and I love your videos! (I spent like 10 minutes writing this lol)