It’s amazing. I’ve been taken outta context constantly. Is this the only way folks can debate? LOL. Weak.
the ground is definitely used. But most kids either push off the ground or leverage the ground with a sway. Both are incorrect and leaves a hitter with a unbalanced compensatory pattern. The ground should be held onto during the swing and also used for stabilization when launching the swing.
the hips are used for rotation. Both upper and lower body take advantage of the hips. BUT THE OBLIQUES CREATE LAUNCH. The gif of shirtless Ted shows it. The middle is where the energy originates from. Counter rotation is the energy source. Sure the glutes are used to help facilitate the move forward but they are not the originator.
You cant say that the obliques move the hips and then claim to be taken out of context. This is simply not how the body works and it is not a debate.
The most that happens to the pelvis (from obliques while feet are on the ground) is a MAYBE few degrees of tilt. The obliques can only move the ribs closer to the pelvis. This is because there is like 50+ pounds of muscle attaching both legs to the pelvis. Anchoring it.
Also, take a look at shirtless Ted's Right quad. It is flexed as his leg is straightening and moving his pelvis. His leg is moving his hip.
The lower body moves the hips/pelvis so that the obliques are stretched and can contract with maximum force. They keep rotating through the swing to try and keep the obliques stretched so they can keep contracting.