For example if you press your chest a bit forward as you move to let your partner or attacker finish his intended movement there will be a counter reaction in his hand from the unconscious mechanism which keeps us in place and gets us killed many times by fighting for a place instead of moving. Add to the first movement a hit from your forearm on the upper or lower side of his pushing arm and let your hand rotate naturally to find the best place to deliver this snap lever. Practice with care and keep breathing.
Have a partner place his hand on you and push. Move that part of you which is in contact with his hand away from the hand and note how this effects his movements in different ways. Now repeat and instead of moving away press that part or move as a whole in an angle to his movement so if he pushes your chest backwards you move to the side and forward. This lets (if you do this by choice rather than fright) you strike and lever his limbs and body due to the added contact and density in the point of contact. Otherwise he will find it much easier to escape the contact and build his spirit.