I ride ~20 rt per day and don't find myself just up and out for a workout on the bike on the weekends (however I will use the bike more for neighborhood trips more as the weather improves; turns out I am an all weather commuter but a fair weather pleasure rider). I usually focus on yoga or yardwork to shake up the physical output on the weekends. If I do go on a weekend ride, I either don't ride in on Friday or I ride really, really easy. My home commute involves a lot of very steep hills no matter which direction I go so that exacerbates the leg fatigue.