Chakra-Enhanced Strength is a special type of taijutsu that uses the perfect chakra control so needed in the mastery of iryōnin. The user accumulates chakra in their fist or foot, and at the moment of the strike releases it precisely into the target. As a result, even a single blow shatters the ground, breaks stone, and can kill the opponent. Mastering it requires grueling training - Tsunade, for example, made Sakura Haruno practice the technique against her at full strength, giving no leniency.