I'm willing to bet that it's not your property. The land owner actually is legally responsible if someone gets injured and sues.
Just a heads up, unless you have your name on the title to the land then you should probably check with your parents first. If they let you do it then fine but don't just start digging holes randomly in your backyard. I know my parents would freak if I did something like that.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE