Best friends from Dayton, Tenn. and Paint Lick, KY.
Olympic hurdlers from Richmond, VA. and Hampton, VA.
A couple from Nederland, TX and Grand Rapids, Mich.
A couple from Somerville, Mass.
Pro volleyball players from Honolulu, HI.
Sisters from Lafayette, LA.
Siblings from Fremont and Berkeley, Calif.
Sisters from Bluffton, S.C.
They are former NFL stars from Charlotte, N.C. and Middleburg, Fla.
A father-son duo from Louisville, KY.
They are married parents from Houston, TX.