Calories to Burn Goal

MismatchedAlmonds

So I'm looking at balance beam/ball exercises so I can do a versatile workout in my living room. One website estimated "A person weighing 125 pounds can expect to burn about 150 calories -- and 300 in an hour -- while a person weighing 185 pounds can expect to burn about 222 -- 444 in an hour."

Is that a good workout?