I got something similar to this. It also started out a few days before during a night of drinking and talking shit. I start giving my buddy shit that he was never fast yadda yadda. He throws out a bet, don't remember what it was. Well that's all it took, i'm not backing down from most bets and KNOWING i can't beat him. So one morning we go out to the park to settle this shit show. Were gonna do it in the parking lot but decide to move it to the grass. As i'm walking on the grass it's so soft i can feel the ground moving as i walk the 40yrds first. Great sign of things to come.
We take off and about half way there i start to lose my balance and as i start leaning forward i start doing the windmill motion with my arms. At this point i'm thinking "no biggie, i'm gonna fall, i'll just roll forward and pop up like i see all the pros do". Well that didn't work out, shoulder planted into the soft ground and i skidded to a stop scrapping my whole left side. This was about 10yrs ago and i'm reminded about it every time we"re drunk and start talking shit.
These days a weight lifting competition would be better. I'd probably still lose but my slow ass would stand a better chance.