Math

Sometimes when the workouts are piling up and the intervals feel longer than the clock says it feels like I'm running into a stacked stone wall somewhere in the countryside. Not a blip on any radar, not much more than a grease stain laced with lactic acid. I'm getting work done, not for any other reason besides it feels good to stop. If it hurts then when it doesn't hurt anymore I can do the math to know I did it right. Addition and subtraction.