Actually it is good, because tightening your stomach muscles strengthens them and supports your back, especially if you are lifting or moving something.
Self inflating rafts come with their own compressed air; that's why they are self inflating. If it was not self inflating you would have to pump air into it to inflate it. In either case, rafts can be inflated by any form of gas, it does not have to be oxygen.
Yes but it can be dangerous sometimes! If the type of ink you use has toxins in it, that can be dangerous. Be safe!
By breathing in and out and inflating our LUNGS
By breathing in and out and inflating our LUNGS
ducks are not really dangerous, but if you bother one you cannot count yourself lucky.
Self-inflating rafts have a CO2 canister that inflates the raft when it is triggered via manual or pressure release
no, its flammable.
reversible
Yes, it is and eventually you will die.
Only if you don't protect yourself and your children.
yes it is very dangerous, first you will develope hair all over your body, then have an undesireable urge to lick yourself and howl at the moon.