Martin slaps Slavo
Martin Cooper is the bloke who first tried to teach me to slap correctly. The motion is so simple yet the impact is very concentrated.
As you can see, it does not depend on a big wind up nor a lot of muscle. Coops is a big guy but his slaps did not hit big, they hit deep inside. Sometimes he hits with the palm-heel and sometimes the whole hand. It is practiced skill, not strength, that allows him to have such a small movement effect such a large impact.
Martin has hit me like this, on my chest. It took my breath away, all the way to my toes.