If you go in your streaker calendar, on the day you did strength training, click on the little +- (plus minus) sign next to your number or on that day, and then you can enter 1 mile of "other" exercise. If I recall correctly, 20 mins of any exercise counts as one mile or something like that.
Great job and best of luck on the March streak!
Edit: since you did 40 mins, I think this would count as 2 miles of "other" activity.