Kids in trees

My children love to climb on ropes courses.  This I don't understand.  It involves stepping into a harness which grips your thighs like too tight underwear, and goes around your waist creating the largest muffin top you have ever seen (well on me anyway, not so much on Noah....)  Then with a series of metal clips you hook and unhook yourself to a metal rope that has been strung between two trees anywhere from 8 to 16 meters above the ground.  You then step, swing, jump, pull yourself on a variety of wobbly logs, thin wires, swinging objects from one small wooden platform nailed to the trunk of a tree to another small platform. Did I mention that said platforms are on average 10 meters (that is 30 feet!!) in the air.  Occasionally you clip into a zip line which involves one little metal device which goes onto a wire, you then launch yourself off the platform nailed to the tree and hurtle yourself towards the tree the wire is attached to.  Important to keep your legs straight out and one hand on top of metal clip holding you to wire so you don't spin around and hit the tree full force backwards.  This is hard to do if your are trying to cling to the platform gravity is pulling you away from.  A bit like flying for 10-15 seconds.  I will leave the flying to the birds and my children.