Poor Sprinting Technique Hurts You

About 8 years ago, I was playing a round of golf about 1.5 times per week, and usually practicing once during the week.  But I couldn't break 90.  I was self-taught, and had terrible technique.  My swinging form emulated my baseball swing.  I would actually touch the back of my head in my back swing, and it sometimes would push my hat clasp into my skull, which didn't feel good at all.  Once, I was hitting range balls, and the caged cart that drives around picking up balls drove nearby my tee box.  The driver said "if you haven't had lessons, you should get some before you ruin your swing forever".  I wasn't the worst, but I was bad enough that it frustrated me, injured me, and brought random insults against me.

Today, I noticed a similar problem with my cycling form.  I am often a lazy sprinter.  Sometimes, when I get out of the saddle, I'll let my form disintegrate and drift all over the place.  I forget to try to keep my rear over the saddle.  I lean forward, taking weight off the driving rear wheel, and swing the bike wildly from side to side.  I know better, but I just get sloppy.  Every few months, I get a nice physical reminder to return to good form.  I get so lazy, and so out of control, that my knee will touch the stem.  Yep, that's crazy, but it happens.  The injury comes from the screws that hold the stem onto the headset.  There's about one full screw thread that is exposed, and it's sharp, and if you let your moving leg slide across it, it lacerates.  Which looks like this:

And if you were distracted by the forest of ever-thickening leg hair or by the pure cycling energy pouring from my powerful lower leg, then my apologies.