<human>: Can you summarize the given text in a few sentences?

So happened over the weekend. Me and my brother had started building down hill jumps for our mountain bikes. I found two trees about 4 feet spaced apart I put a piece of 2x6 wood on each side and screwed in for a solid place up setup the ramp. It was about 5 feet off the ground. I setup the ramp part next using a 2x6 that was about 5 feet long and I put a cinder block under the center standing straight up for extra support. I screwed in the top to the base I added on the trees. Without adjusting my shocks. I went to the top of the hill started going down the trail off my ramp got nice air landed very hard and bottomed out the shocks which is bad for them. I decided hmm maybe I'll turn them all the way up. They're basically solid I'm like hell yeah I'm ready I go off the ramp again pulling off the top I'm like 6 feet in the air over clearing the downhill landing so at this point I'm 7 or 8 feet off the ground landing flat my shocks go down 3/4 of the way and instantly recoil all that force back up. I end up bouncing off the ground going over the bars landing directly on my left cheek sliding across the ground. A bit dazed I go to pick my head up and get slammed in the back of the head by the forks of my bike hitting my face into a stone on the ground knocking me unconscious for about 10 seconds. Never used that ramp again...
<bot>: built a jump turned shocks all the way up over cleared the landing bounced over the handle bars and got knocked out by my bike...