You get serious racers...
...and some who are running hard but only racing themselves.
Some folks are out for time with family...
...or friends.
All but one of these photos were shot with the Canon EOS 5DS & 70-200mm f/4L IS.
I tried something new this time by shooting in shutter priority. I figured that 1/500th would be enough to adequately stop motion and I gambled that it would still be reasonably sharp at 200mm, so I put the mode dial in "Tv" ("Time value" in Canon-speak, it's the position on the dial that's marked "S" for "Shutter" on pretty much every other manufacturer's cameras) set the ISO to 200, and rolled the dice.
I'm not unhappy with the results.
.