foot is healed

Date	Celsius ° (C*9/5)+32=F	Place of run	Duration	start time	5 laps on the stairs (up and down)	weather
29 Jan	≈ -20	Moscow, Russia	≈ 19:46.95	8:20		overcast

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I see now that one lap up and down the stairs should take about 4 minutes. I did 5 laps today—each at or near exactly 4 min. Now I have the baseline. My foot was painless today.
I think the injury was a simple bruise that came on slowly and retired after a bit if rest.