The art & science of asking questions is the the source of all knowledge" - Thomas Berger

My kids like to jump on the bed. Is it ok?

It is definitely a no no.  Mattress is made for sleep.  When we sleep, we lie down flat either on our back or sideway.  Our body weight thus is dispersed through a series of coils beneath us.  If we are to jump or stand on the mattress, our weight is solely supported by a handful of coils beneath our feet.  Those limited coils alone, are not able to withstand the entire weight of our body.  In this case, it will be identified as an abuse on the mattress, which will make the warranty void.