Tori and Uke grapple in right natural posture. Tori steps forward with his left foot, then right foot, then left foot again, pushing Uke backward, and comes to a halt controlling him with both hands. Uke is pushed and steps back with his right foot, then left foot, then right foot again. He holds his ground and begins to return to a stable posture.
At that moment, Tori steps his left foot diagonally back, and lessens the pushing action of both hands, and pulls, so that Uke begins to transfer his body weight onto the advancing right foot. At that moment, Tori steps his right foot inside Ukes left foot, and takes a right han-mi (extreme right) posture. At the same time, he lifts and pulls upward with his right hand, and pulls upward with his left hand, lifting Uke to the right front corner, and breaking his balance.
Tori bends his right knee and, lowering his body, turns round to the left pivoting on the tip of his right foot, and steps his left foot back and round inside Ukes left foot. While still holding Ukes left collar with his right hand, he pushes into Ukes right armpit, pulls with his left hand covering Ukes right arm, and puts the back of his waist tight against the front of Ukes thighs and waist, loading Uke onto his back.
At the instant Ukes body begins to rise onto Toris back, Tori straightens both knees, raises his waist, loads Uke onto his back with both hands, and throws him forward. Uke is thrown in a large rotation around the fulcrum of Toris right shoulder.
When Tori pushes Uke and Uke pushes back, Tori skillfully leads him forward and, lifting him to the right front corner, breaks his balance in a continuous and flowing action.
There are two actions when Tori inserts his right elbow inside Ukes right armpit: pulling up with the left hand to break Ukes balance, and opening a gap inside Ukes armpit.
When Tori inserts his right elbow, the wrist should be natural, not rigid and strong, and this must be combined with the action of turning the body. Tori must place his right forearm tight against the armpit. At this point, Uke rises onto his tiptoes and Toris feet are positioned inside of Ukes feet with his toes pointing in the same direction as Ukes. The area from the back of Toris waist to his back should be tight against Ukes lower abdomen and chest.
Tori pulls with both hands, and in a single breath, straightens both knees, raises his waist, bends his upper body forward, and lifts the front of Ukes waist up with the back of his waist. He synchronizes the actions of springing up with his waist, using vigorous energy from the knees, and pulling down with both hands to throw Uke forward over his right shoulder.
Seoi-nage is not executed by loading and lifting with both hands. Tori pulls and breaks Ukes balance with both hands, but if he tries to load him the technique will not be effective. It is the momentum from turining his body, straightening the knees, and raising the waist that are necessary to throw Ukes body.
When Ukes balance breaks toward the right front corner in an extreme right posture after he takes a large step forward with his right foot, Tori must bring Uke thight against him by taking a large step back with his left foot, and turning around.
Tori jumps low inside Ukes chest so that his knees are close to the mat, raises his waist and his knees clear of the mat, and loads Uke onto his back.
If Tori throws Uke without loading him onto his back at this moment by simply pulling down, then the technique becomes seoi-otoshi