Sentire is one of my favorite words either in Latin or Italian (as well as in its vulgar French Provençal or Spanish) because it means both To Hear & To Feel equally – as though Romans knew that ears feel the movement of air.
My pun on Metric Centuries or 100 Kilometers is unavoidable; if you ride often enough you get the feel of how possible the longer rides within the given time frame. You feel the century in your legs, both its possibility & its actuality. Levels of acceptable fatigue & pain vary throughout the season, but Metrics provide a good measure for longer rides.
What in the end one is capable of (we can call it the Measure of us) starts as something felt either physically or aesthetically.
Ecbatan 