BE90 - Free Walk on a long rein- in the tests at EBF,HXF, MXK
You are looking for the horse to have a bigger length of stride than in medium walk and to have a good overtrack.
You do not want them to hurry but be rhythmical, stretching down and forward through the neck, taking the contact.
When you have turned onto your line let the reins be taken progressively do not throw them at the horse as they will go baggy and you will have no contact.
In this video you can see that the horse needs to slow down and take more deliberate steps and stretch down and forward more. (This will come as his strength and then balance develops).
You will need to do this movement EBF, HXF, MXK in BE90