These kind of hops require a good balance control and must not be attempted by novice gymnasts on a high beam. After the athletes have demonstrated acceptable proficiency on a low beam they can progressively move a skill to a medium beam and later on to a regulation height beam. Any type of basic drill hopping on one single leg should be trained on support feet.
The gymnasts' goal while performing the full turn with the front leg in a stag position is to complete the skill with the leg still in a horizontal line. The gymnast should also bring it down with control instead of dropping the leg down too early during the turn. The stag leg must be turned out.
Though this is not a perfect front hip circle example, notice how the gymnast raises her center of mass forward to begin falling down without changing her body position. Then, when gravity starts to accelerate her fall, she pikes slightly to add some extra circular momentum while keeping pressure on the legs to allow them from moving away from the bar even at the moment that she briefly lets go of the bar to shift her grip around to prepare the hands arrival to a full support.