Ichi and Ni are brothers. They are indoor/outdoor. They have very good appetites. While Ichi is active most of his waking hours, Ni takes naps and just lays around (not lethargic, he runs and plays around when he feels like it). Now I have noticed that Ichi is muscled and quite "compact", while Ni is getting pretty round and flabby. Is there really such a thing as a LAZY CAT who must be forced to exercise?