Athlete-first
Tyzle begins with the individual athlete, not a predefined methodology. Training choices should emerge from the athlete's state, goals, and reality.
Your Adaptive Edge.
Coaching that learns the athlete.
Tyzle builds an evidence-based understanding of your training history, patterns, goals, and changing reality so future coaching can adapt to you rather than forcing you into a fixed template.
Built for serious endurance athletes, with an initial cycling focus.
Why Tyzle
Understanding comes before coaching.
Tyzle starts by improving the athlete model: what is known, how it is known, what has changed, and where uncertainty remains.
Evidence-based
Validated activities become immutable evidence. Deterministic measurements summarize that evidence before any belief or recommendation is formed.
Explainable
Important recommendations must be reducible to evidence through reasoning, beliefs, measurements, and provenance.
Adaptive over time
Athletes change. Tyzle preserves history while giving temporally relevant evidence more weight when describing the athlete today.
From history to understanding
A traceable path from activity history to coaching support.
Imported history is not treated as one lifetime average. Tyzle keeps the evidence, calculates reproducible measurements, recognizes that athletes change, and exposes the reasoning behind its current understanding.
Training historyFIT files and Strava activity data
EvidenceImmutable accepted observations
MeasurementsVersioned deterministic calculations
Athlete understandingBeliefs with confidence and scope
Explainable coachingFuture guidance grounded in evidence
Recency-aware
Understand the athlete today without erasing who they have been.
A long training history is valuable only when time is modeled honestly. Tyzle distinguishes historical truth, current state, established tendencies, and transitions between athlete eras.
Older evidence remains useful for context, comparisons, and change detection. Recent evidence matters more when the question is who the athlete is right now.
An athlete may have trained 20 hours per week years ago and approximately 7 hours per week today. Tyzle preserves both truths while giving recent evidence greater relevance to current understanding.
Current capability
What Tyzle currently does.
The private beta is early, but the core evidence and athlete-understanding foundation is real.
Current private-beta capabilities
- Imports local FIT activity history.
- Connects to Strava with athlete authorization.
- Maintains immutable activity evidence and provenance.
- Calculates deterministic training-history measurements.
- Identifies changing training eras.
- Surfaces current training context.
- Explains what it knows and what it is still learning.
Where Tyzle is going
- Additional authorized provider connections, including Garmin and TrainingPeaks subject to provider access approval.
- More athlete observers that learn bounded, explainable patterns from longitudinal evidence.
- Explainable adaptive coaching based on the athlete model.
- Planning that respects real-life constraints, availability, preferences, and athlete control.
Privacy and control
Athlete-authorized access. No advertising model.
Tyzle uses athlete data to provide the Tyzle service and improve that athlete's personal experience.
Authorized by the athlete
Provider connections are athlete-authorized. Tyzle requests read-only activity access where supported and does not post activities to Strava.
No sale or advertising use
Tyzle does not sell athlete data, use connected athlete data for advertising, or disclose provider data to data brokers.
Disconnect and delete
Connections can be disconnected. Account and data deletion can be requested, subject to legal and backup-retention requirements.
Private beta
Interested in Tyzle?
The current site is static, so private-beta interest goes through email rather than a fake sign-up flow.
Join the private beta
Send a short note with your sport focus, current training tools, and what you would want adaptive coaching to understand about you.
Direct contact
Email hello@tyzle.com with the subject Tyzle private beta.
No analytics, tracking cookies, or backend collection are enabled on this website.