Yah. try it, sometime, it's also a lot of fun. If you go to the gym now, you have the option of using a small blow-up foot cushion to stand on and provide an unstable platform. Why? So that your trunk (core muscles, including the abdominals) have to work hard to steady the body whilst you lift the weight. Charles Atlas noticed that the wild animals, e.g. lions and tigers, never needed to lift weights to keep strong. So he identified that they were performing similar isometric-type exercise (made famous since by various people reporting on the Shaolin monks exercise regime, too).
And it helped a lot that it was an in-ground trampoline, so I could learn all sorts of tricks, like backward somersaults ... I remember the only other guy that wa near to my skill level had started a "challenge" when I got to school one morning, whereby he had treid to set a record of how many somersaults he could do in a row without pause.
Very silly idea, in retrospect. But I managed to beat his total of about 24, I think.