A leader is either a partner-centered leader or a self-centered leader. The former leads the woman gently, thoughtfully, attentively and patiently in accordance with the physiology of her body. The latter, on the contrary, tends to coerce her do things beyond her comfortable zone. For example, he leads her take very large steps, which the former would divide into smaller steps; or leads her chase the beats, whereas the former would allow her time to finish her steps; or leads her do arbitrary figures, whereas the former would use simple steps to display her natural beauty; or focuses on his own performance and uses her as a foil to his self-centered exhibition, whereas the former would accommodate her, shine her, and let her be the center of attention.
Here is an example of self-centered leading.
In this example, the man only focused on his own performance. He hastily chased the beats and rushed the woman to make awkward movements and drastic turns but failed to follow the mood of the music to allow her feminine beauty to shine. (See Revealing Her Beauty in Tango.) As a result, his self-exhibition overshadowed her performance.
In contrast, a partner-centered leader dances for the woman. Here is an example of partner-centered leading.
In this clip the man did not force the woman to take big, awkward steps, as being the case in the first clip, but led her dance in natural steps to reveal her feminine beauty. He did not coerce her with the arms and hands, as being the case in the first clip, but kept her in the comfort of his embrace and led her very gently with his torso. He did not make her dance against the inertia of her body, as being the case in the first clip, but led her by the inertia to make the step easy for her. He did not force her to rotate on a tilted axis, as being the case in the first clip, but adjusted his position to accommodate her and facilitate her turns. He did not lead her do abrupt movements, as being the case in the first clip, but waited for her to finish each step before he led the next step. He did not rush her to chase the beats, as being the case in the first clip, but allowed her time to complete her steps.
These made it possible for her to focus on the communication of feelings and on the quality of her movements. Because the woman dances around the man, she needs to swivel her hips in order to step on his side. (See Dissociation and Gear Effect.) The hip rotation, while highlights her femininity, takes time to complete. The man must understand that and allow the woman time to finish her movement, as demonstrated in this video thanks to the excellent lead. We can tell that she appreciated that by the way she looked at him at the end.
Watch the video again in full screen to see how beautiful a woman's dance can be when she has a good leader. I recommend to use this video as a teaching tool. Every man, novice and veteran alike, can learn a lot about how to lead from this video. (See The Elegance of the Mionguero Style.)