"One of the things traditional martial artists are referring to when they talk about “Tendon Strength” is the recruitment of long chains of muscles, tendons, ligaments and joints to generate whole body power. This can manifest as a resistance force or the emission of force over a short distance. Rather than relying on segmented movements that increase momentum to generate power, internal styles try to initiate force from the whole body moving as a unit. "
The rest of the article: www.internalartsinternational.com/free/tendon-strength-fascia-the-sinew-channels-internal-martial-arts-part-1/