Spekkio
He bowls overhand.
When I was there, DIs called cadence for the warmup lap. The actual runs were at full speed, so if you can call cadence you're not running fast enough.Yes candidates are often encouraged to call cadence (at least my class was in later weeks) and yes you can be a "drill body" who will be the "go-to" guy for the can't-get-right's in your class who are marching completely out of step and have two left feet.
As for drill bodies, yes they existed, but it went like this: "Drill body, in the morning I drive the bus. You can have them the rest of the day."