Part 2: The Science Behind Velocity Based Training

MooreMuscle.com • Velocity Based Training Series

In Part 1 of this series we introduced the concept of Velocity Based Training (VBT) and why it’s becoming one of the most effective ways to regulate strength training. Now we go deeper into the science behind it.

The reason VBT works so well comes down to one fundamental relationship in strength training: load and velocity are directly connected.

The Load-Velocity Relationship

Every athlete has a measurable relationship between how heavy a weight is and how fast they can move it. When the weight on the bar increases, velocity decreases in a nearly linear pattern.

This is why bar speed can tell us so much about training intensity. Instead of estimating effort based on percentages, we can measure the actual output of the athlete in real time.

Because this relationship is consistent, coaches can estimate intensity simply by measuring how fast the bar moves.

Why Bar Speed Predicts Strength So Well

Research has shown that velocity is strongly correlated with relative load. In simple terms, the speed of a lift tells us roughly how heavy the weight is relative to the athlete’s maximum for that day.

For example, most lifters will move a true one-rep max at roughly 0.15–0.30 m/s. That velocity range is remarkably consistent across trained athletes.

This allows coaches to monitor performance without constantly forcing athletes into maximal attempts.

The Force–Velocity Curve

Strength and speed exist on a spectrum known as the force-velocity curve. The heavier the load, the greater the force required to move it, but the slower the movement becomes.

Training across this spectrum develops different athletic qualities:

• High Velocity / Low Load: Explosive power and speed
• Moderate Load / Moderate Velocity: Strength-speed
• Heavy Load / Low Velocity: Maximal strength

Velocity Based Training allows coaches to intentionally target specific parts of this curve instead of accidentally drifting into the wrong stimulus.

Understanding Velocity Loss

Another powerful concept in VBT is velocity loss.

Velocity loss measures how much bar speed drops from the first rep of a set to the final rep. As fatigue accumulates, the bar slows down.

Monitoring velocity loss helps coaches manage fatigue and maintain training quality. Instead of pushing sets until form breaks down, training can stop once velocity drops beyond a predetermined threshold.

Why This Matters for Strength Athletes

Traditional training methods rely heavily on percentages and subjective effort. Velocity Based Training adds an objective measurement to the process.

That measurement gives athletes immediate feedback about how their body is performing on that specific day.

• Bar moving faster than expected → athlete may be ready to increase load
• Bar moving slower than expected → fatigue may be limiting performance
• Velocity dropping rapidly → fatigue accumulating during the set

This real-time feedback allows training to stay aligned with the intended goal of the session.

Coming Next in Part 3

In Part 3 of this series we’ll move from theory to practice. We’ll break down exactly how to implement Velocity Based Training in your own programming, including how to choose velocity zones, how to adjust loads, and how to structure a VBT-based training session.