There's probably a comma missing in my sentence, I meant, if starting the routine on Monday, rest day on Saturday and in Sunday go for a ride.
I agree rest days should be rest days. I've paid the price of not resting a couple of times too many already.
I occasionally run/cycle/hike/shovel snow/etc. as well, but working for the three weight lifting workouts per week. I'm not faithfully "doing the program", but incorporating elements that work for me into my life.