Starting YETI month 4. Feeling some wear and tear, mostly around R glute at the moment, which I can feel on hills and even going up stairs.
Have started tracking training load by TRaining IMPulses (TRIMP) using Kenny's beta graphs. Doesn't show on current week, but arrow back to prior weeks to see it. Basic premise is that training builds both fitness and fatigue, but fatigue dissipates faster. Graph shows if you're in a net fatigued or fresh state. Loading is calculated by summing the minutes in each intensity level times an empirical factor for each level. Currently I'm using 1, 2, 3, 4, 5 as the factors, but may tweak them as I see how it works.