Is it possible to break your ankle/foot while doing a backflip on a trampoline?
Yes, if you land wrong.
How to Backflip on a Trampoline?
A fairly simple, although risky if not performed correctly, aerial manoeuvre, read below and perform with caution!
How to Do a 180 Backflip on a Trampoline?
Many people always wanted to do cool tricks on the trampoline but never knew how. This one will people jealous of you every time; the 180 Backflip.
Is it Possible to break a glass with sounds........while only using the speakers from your computer?
depends on the decibels of your computer speakers. Mythbusters proved you can do it with the human voice (amplified), so yes, it can be done with sound. A laptop, probably not. Some good desktop...
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How to Do a Backflop Backflip on a Trampoline?
this is how to do a cool back-flip for starters