There's no such thing as too much cardio. After my morning full-body workouts, I do a 35-minute, 400-calorie bike ride, then rest for 6 hours while aiming for 25,000 steps a day. In the evenings, I do my rowing workout. My body still recovers well, and I recently front squatted 140kg for 5 reps with 3-second pauses (I used to do Olympic lifting). Just gradually increase your volume and cardio tolerance, and you'll see great benefits. Plus, since we're using gear, our bodies can handle more than others. Take advantage of that and avoid 19nors.