for half the group and four hoops
Have most of the players scatter all over (the horses).
Have another group of players, rope in hand, stand in the corner with
one foot in a hoop (the riders).
On signal, horses gallop around.
On another signal, the riders run out and try to tag a horse..
Once tagged, the rider puts the rope around the horse's waist and
steers him back to a deignated area.