Smart Goal-based Velocity-Based Training

VBT has amazing and unique potential to supercharge the training experience.

Vitruvian Trainer already has all the needed data to implement this and change the game.

There are many academic papers and studies around it but the main idea is that as fatigue kicks-in the Velocity (mean concentric velocity) slows down.

Goal-based Training Zones & Realtime Feedback (Fatigue Monitoring / Auto-regulating Volume)
The most common methodology is to compare the Velocity of the first rep of a set with the latest rep of the same set. If the Velocity drops by more than X% the target of the set is achieved. This refers to fixed weight per set (so Old School mode) and for the main working sets mostly.

X% is set based on the goal of the user. Common Velocity Thresholds are:
- Hypertrophy: 20-40% [ Accumulate fatigue for muscle growth ]
- Strength: 10-15% [ Preserve intensity, avoid CNS burnout ]
- Power: 10-20% [ Fast and high quality reps only ]
- Explosiveness/Speed: 5-10% [ Fast & crisp reps only]
this could be simplified to: Hypertrophy, Strength(, Explosiveness/Custom)

App:
So during for example a set that has VBT for Hypertrophy, on the initial rep the baseline is set (e.g. 0.45 m/s),
Rep 2: 0.43 m/s (4% drop)
Rep 3: 0.42 m/s (6% drop)
Rep 4: 0.40 m/s (11% drop)
Rep 5: 0.37 m/s (17% drop)
Rep 6: 0.34 m/s (24% drop) - now the user can stop if they choose so
Rep 7: 0.31 m/s (31% drop) - they still feel go so they do more reps, still within range
Rep 8: 0.28 m/s (38% drop) - probably next rep will move them out of range, so optionally suggest stoppage

This is a case where the user choose a good weight.
But this would be even more useful for users trying a new exercise, that could help them identify that they lifting too low weight if they end up doing 20-30 or more reps to breach the Velocity Threshold.