I'm thinking something like: run 10 miles. Shoot 10 targets. Run another 10 miles. Shoot 10 targets. Finish 6.2 miles, with a penalty 100m for each missed shot. Have a shorter version, also, with the running legs half the length.
The PTB tolerate biathlon in the winter; it works pretty much the same way.
I'd do it too, even though I'd never be anywhere near 'world class'.
