Honestly, don't pick an athlete that is in the business of being strong. That'd take an elite level coach. Pick a sport that could use improvements in strength that could probably be solved with a simple MWF Squat, Bench, Row type routine.
Do not; Powerlifter, Oly Lifter, Strongman.
Do; Golfer, Swimmer, Baseball, Basketball etc.
If you need help, PM me.