I always do my weight work after a bike ride. On Monday (rest day) I go hiking or snowshoeing, Z1. Friday in season I do Z1 on the rollers, maybe 45'. This time of year, I'll use the StairMill, Z2 on Friday. But it depends. If my legs feel dead on Friday, I'll take a real rest day. "They say" that most people don't go hard enough, or go easy enough. If you have no symptoms of overreaching, like high morning resting HR, maybe you don't need to rest. This time a year a little cross-training is a good idea, I think.