O Soto Gari is Ashi waza (Foot / leg techniques) employs a “destabilize the upper body, reap the lower body” strategy, and is effective in competition.
O Soto Gari – Major Outer Reap in dept video tutorial
From a right natural posture make Uke step forward on his right foot by pulling him gently towards his right front corner with your left hand. Use your right hand to draw Uke’s lapel towards Uke’s right front corner.
As Uke transfers his weight to his right foot, begin to drive Uke’s right elbow down towards his hip so that his weight is planted firmly on his right foot. Use your right hand to drive Uke’s left lapel towards his right rear corner. At this point, Uke’s weight should now be placed on the back outer corner of his right heel. While you are making a strong drive to off-balance Uke, step wide of Uke’s right foot with your left so that there is ample room to swing our right foot through. The direction of movement should be towards Uke’s right rear corner. To much to the rear or to the side and the effectiveness of the technique is diminished.
Now that your right leg has swung past Uke’s right leg, reap, or sweep, backwards and outwards as strongly as possible near the middle of his right-back-outer-thigh with the same area of your own right thigh. The contact should be against the back to side of Uke’s right leg. As you reap Uke’s right leg, you should also be making contact with Uke’s chest and right shoulder with your own right shoulder. Any distance between your right shoulder and Uke’s right will provide Uke an opportunity to counter this technique with O Soto Gaeshi.
Synchronize the action of your reaping leg with a strong downward pull with your left hand holding his right sleeve, together with a reinforcing push to his right back corner with your right hand holding his left lapel. With close contact and a well timed attack, Uke will have few options.
Uke will fall backwards and towards his right corner, with his legs lifting up into the air, by the force of your movement.