v0.1.0 – Initial Release

Release Date: November 15, 2025
Version: 0.1.0
We are proud to announce the official release of Side-Track version 0.1.0. This release focuses on the passive workout logging and intelligent muscle capacity prediction. The core of this release is the introduction of a fatigue model that adapts to your specific strength levels in real-time.

Major Features

Automatic Strength Learning (Auto-1RM)

Side-Track now eliminates the need for manual data entry regarding your strength limits. The application attempts to learn your capacity as you train.

• Real-Time PR Detection: Every set logged is instantly analyzed against your current strength profile using the Epley formula. If a set indicates a higher One-Rep Max (1RM) than previously recorded, your capacity limits are automatically updated.
• Dynamic Difficulty Scaling: As your estimated 1RM increases, the fatigue calculations for future workouts automatically adjust. A weight that drained you significantly last month will drain you less today as your strength profile updates.
• Historical Synchronization: For users with existing data, a new “Auto-Estimate from Workout History” tool in Preferences scans your entire log history to build an accurate strength profile instantly.

Visual Muscle Engagement System

The Workout Screen has been redesigned with a new tabbed interface to provide predictive insights before you perform a set.

• Exercise Info Tab: A dedicated view showing exactly which muscles are targeted by the current exercise, sorted by involvement percentage.
• Predictive Fatigue Analysis: When selecting weight and reps, the display updates to show the predicted “drain” on your muscles before you log the set.
• Live Capacity Monitoring: Muscle capacity is visualized with color-coded bars:
  • 70-100%: Fresh and ready for heavy load.
  • 40-69%: Moderate fatigue; performance may degrade.
  • 0-39%: High fatigue; failure is likely or rest is required.

Advanced Fatigue Modeling

The underlying mathematics governing muscle fatigue have been rewritten to mirror human physiology more accurately.

• Exponential Fatigue Scaling: The model now uses exponential scaling rather than linear. Lifting 90% of your max will drain muscle capacity significantly faster than lifting 50%, accurately reflecting the metabolic cost of high-intensity training.
• Muscle-Specific Recovery: Recovery rates are no longer uniform. Large muscle groups (like Quadriceps and Lats) now have different recovery curves compared to smaller groups (like Biceps and Deltoids), based on biological recovery windows (24-48 hours).
• User-Specific Intensity: Fatigue is calculated based on your personal 1RM. A 135lb lift is calculated as a warm-up for advanced users but a maximal effort for beginners, resulting in different fatigue impacts for the same weight.

Enhancements

User Experience & Customization

• Authentication Overhaul: Replaced custom auth with a Supabase implementation of auth, supporting secure Sign in with Apple and Google.
• Physics Engine Configuration: Advanced users can now fine-tune the fatigue algorithm in Preferences. You can adjust the “Fatigue Sensitivity,” “Recovery Rate,” and “MET Coefficient” to match your personal conditioning.
• Manual Capacity Overrides: While Auto-1RM handles most updates, users can now manually view and edit their estimated maxes for all 27 supported exercises via the Preferences menu.

Bug Fixes

• Bodyweight Calculations: Fixed an issue where bodyweight exercises (like Pull-ups and Dips) were not correctly factoring in user bodyweight for fatigue calculations.
• Tab Navigation: Resolved layout shifts when switching between “Log Set” and “Exercise Info” tabs.
• History Deletion: Fixed a consistency issue where deleting a workout log did not always immediately reflect in the stats summary.

Getting Started with v0.1.0

1. Update Profile: Ensure your bodyweight is accurate in the Profile settings, as this affects fatigue calculations for bodyweight movements.
2. Sync History: Navigate to Preferences > Exercise Capacity Limits and select “Auto-Estimate from Workout History” to initialize your strength profile with your past achievements.
3. Review Settings: Check Preferences to ensure the “Fatigue Sensitivity” is set to your desired training difficulty (Default is 8.0).