Moving rocks

Watch this video to get an idea of how much weight one man can move on his own, you'd be surprised.




You might also want to learn about pulleys
http://www.youtube.com/watch?v=9T7tGosXM58&feature=related
or levers
http://www.youtube.com/watch?v=Us2KfO_yrPA
http://www.youtube.com/watch?v=PW7ztbwJKBk&feature=related
and screws, inclined planes, circular levers
http://www.youtube.com/watch?v=v1hjiOp6FEU