Poor Man's Trampoline

My kids are loving jumping on these mattresses!  A kind neighbor was getting rid of them and we took them to use for the month we will have no furniture...sure beats sleeping on the floor!  Until then, they're being stored in the basement and being put to good use as trampolines.  They'd jump for hours if I'd let them.  It's brought back fond memories of my childhood, too.  For awhile we had a queen mattress on our floor in the basement.  Everyday after school, I'd go down there and practice "gymnastics" and have a wonderful time.  I'm guessing they're safer than trampolines since they can't jump as high or fall as far.