Manual training is training perfomed by the player when riding. Training can be done whenever, wherever (insert Shakira GIF), such as on trail rides and in the riding hall.
To train the horse, the player activates one or several Routines via the routine button. Different routines train different stats. Just like with simulated training, there are varying difficulties available. However, the routine availability is determined by the horse's stats, so better horses can access more routines.
Harder routines are more difficult but will also yield more XP. Finishing a routine drains Energy, and a new routine cannot be started if the energy is depleted.
Each routine has 3 steps. Completing all of them yields the most XP, but just finishing one will still give some XP.
Manual routines are a good way to focus on specific stats, while also providing a way to get to know each horse.
Mentality is trained when the horse is presented with, and can overcome, a situation that puts it outside of its comfort zone. If the horse is successfully crossing a bridge with the help of its rider, it will gain Mentality XP.