Footwork Drills — The Dynamic Foundation¶

Five drills built around Footwork Stances — training the body to manage its center of mass instead of just running, using the GSM (Gravitational Boost) and DSI (Dynamic Stability Index) engines directly.

Drill 1: Sinking Split-Step¶

Goal: optimize $S_{gravity}$.

How: hop lightly. As you land, sink the hips 5-10cm lower than usual, then accelerate sideways immediately.

Feel: the ground should feel like it's "pushing" you into the first step, not the other way around.

Drill 2: Axis-Preservation Slide¶

Goal: hold $DSI \geq 0.85$ through a slide.

How: balance a tennis ball on top of your head. Slide side to side to retrieve balls. If the ball falls off, your tilt angle $\Delta\theta$ went too far and your DSI collapsed.

Drill 3: V-Step Transition¶

Goal: optimize the interception point.

How: from center court, step 45 degrees forward, make contact, then cross back to recover. Repeat 20 times per side.

Drill 4: Distributed Braking¶

Goal: avoid a single hard brake.

How: sprint back toward the baseline. Before you arrive, lower your center of gravity and take several small decelerating steps rather than one big stopping stride. A single hard brake kills your ability to move again immediately; distributed braking doesn't.

Drill 5: Elastic Movement (Rubber Band)¶

Goal: train tensegrity through the whole chain.

How: treat the legs and upper body as a single connected unit, like a stretched rubber band. Feel the centrifugal force link continuously from feet, through hips, to shoulders — never as separate, disconnected pieces.