I have 3 sets of hex dumbbells I keep in my living room, occasionally at night the mood strikes and I do a 5-10 minute arm/shoulder/tricep and sometimes back workout. Nothing fancy, basic stuff, high reps. Occasionally throw in high rep sets of pushups to pump up my chest. I don't plan to do them, I go by feel and mood, if I am still feeling high energy at the end of the day, why not. My training is based on the philosophy, make hay while the sun shines, if you feel energetic then train some more, if you feel strong then lift heavy etc..