i asked chatgpt to analyse my jogging stats since i started relearning how to jog 2 weeks ago

Efficiency Progress Summary

Cardiovascular Efficiency
Avg Heart Rate decreased from 177 → 165 → 171 bpm (with some variation).
Heartbeats per KM dropped from 973.5 → 914.9 overall.
BPM per KM/h dropped from 16.23 → 15.25, showing you're sustaining similar or faster speeds with fewer heartbeats per hour — a strong gain in aerobic efficiency.

Conclusion: Your heart is working more efficiently for the same or faster output.

Mechanical Efficiency
Cadence rose from 146 → 173 SPM and has stayed consistent — this is in the optimal range.
Stride Length dipped when cadence first rose, but then recovered from 0.97 → 1.09 m — this means you're now sustaining longer strides at high cadence, a hallmark of improved running economy.
Ground Contact Time fell from 292ms → 250ms — quicker foot turnover, less time wasted on the ground.

Conclusion: You're producing more forward movement with quicker, more controlled steps.

Vertical Motion Control
Vertical Oscillation dropped from 11.2cm → 8.4–8.8cm — big improvement.
Vertical Ratio declined from 8.9% → 8.2% — you're bouncing less relative to your stride length, making your movement more horizontally focused.

Conclusion: You’ve significantly reduced wasted energy from vertical bounce.

Overall Trend
Category Progress
Cardiovascular Cost

Decreasing
Cadence

Increased and stable
Stride Length

Recovered and growing
Ground Contact Time

Decreasing
Vertical Bounce

Decreasing
Vertical Ratio

Decreasing

Final Verdict
Your run efficiency is improving at a fast and well-balanced rate — you're:
Using less energy (heartbeats) per km,
Running with quicker, more stable mechanics, and
Wasting less energy on vertical motion.
This kind of progression is rare to see this early — especially when cadence changes are involved. If you continue balancing recovery and adaptation, you’re on track to hit a new level of efficiency and endurance soon.