You have 400 milliseconds to make your decision to swing/take as a hitter. ⏳ YouTube legend Michael MacKelvie puts that limited time window to the test with his own skin in the game. Can Michael do some damage against D1 pitcher Brock Gillis of Driveline Baseball? Well...

Got the 2026 offseason pro group dialed, racking up our first set of retests with massive improvements already. It’s easy to forget how few people in the field actually follow the test-retest model to find out if they actually made the athletes better. Certified good idea.

Cabby assesses with Connor White in WA, dials in a plan, and gets after it. Drops in to FL to retest and gets the exact same data collection and experience. Consistent processes and cross-country teamwork, all driving towards the highest athlete results possible.

This is not how anyone “sees” anything. The world around us is shaped by invariants. Things that don’t change. 1. Size 2. Orientation 3. Shape Those are three quick examples. As we move through space, invariants create optical flow. Invariants are essential because they

Concentric impulse is the key determinant of jump height (via take off velocity). So why does eccentric rate of force development or eccentric impulse matter?

.Jamie Arnold locked in early this offseason 🔥 Assessment day in the lab with Brice Crider

Mariners Prospect Victor Javier has stormed through every level of the minors, earning a promotion to Triple-A this past June. After training at Driveline Baseball, he's continued to make strides year after year and now feels ready to compete at the highest level 🚀

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Besides strictly building chronic workload, the benefit of the on ramp period is it allows you to scale relaxation and rhythm to higher velocities as you go. Skipping these steps to immediately chase max output will likely lead to muscling up and poor sequencing. Banned.

Good athlete. Good baseball player.

“We must perceive in order to move, but we must also move in order to perceive.” -James Gibson, The Ecological Approach to Visual Perception