At a jump the body of the horse gets the peculiar form both arrangements of forward and back legs and by that it creates conditions of accumulation of potential energy and also consumptions as kinetic energy.The body moves when potential energy became to kinetic Energy.There is a moment between the horse body which is jumping on the earth surface. We can compare the jumping horses body with shortened and lengthened spring. Let`s see the relation between mass and energy distributionat horse jump.  The moment of accumulation nass of horse on back 2 legs is equal to the moment , when potential energy becomes kinetic energy. The moment of equalizing mass of the horse on forward and back 2 legs (moment of the jumping) is equal to the accumulated potential energy becomes kinetic energy.At this moment there is the most amount of kinetic energy. The moment of accumulating mass on forward 2 legs is equal to the moment when the kinetic energy is spent and there is a moment when a horse accumulated potential energy by his peculiar position.