To hit them really hard, as if hitting them with a sandbag
That depends on how much sand is in it. You should be more specific to what kind of sandbag it is.
revetment
Any person at any athletic level can benefit from the ulitmate sandbag. It is a good exercise for anyone who is able to handle picking up the sandbag. You do not have to be very ahletic to use one.
You can't play as the sandbag. (EDIT) Yes, by doing action replay.
Sandbag is not a playable character on Super Smash Bros. Brawl, it was made to be more of a punching bag.
No. u can not play as sandbag in super smash bros brawl but u do get to use him as ant item.
Believe it or not there are websites that feature sandbag workout routines. One certified workout is at: www.ultimatesandbagroutine.com. Sandbags are a great way to lose weight.
sandbag
I have never heard of a sandbag workout. Your best bet would be to check with the local gym and see if they offer an instructional class to demonstrate how it works.
The U value is the inverse of the R value. For R value 19 insulation the U value is 1/19, or 0.0526.
the r value of air is pretty high