Well, depending on the fish, they can be lazy or they can be frisky. My betta is pretty much a guppy, as he won't ever sit still. Then again my last one just loafed around a lot. As long as you change his water(what size tank?) and don't give him too much food(just a small amount each morning), he'll be as perky as he wants to be. It also could be he is sick, so keep a close eye on him. If it looks as if he is having trouble breathing, or develops any out of the ordinary blemishes, then you have a sick betta. Give us some more info on his tank and health condition.
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0.5 Gallon - Orange/Purple Beta Splendens(Caramel) 
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