In WiiFit Plus, I can't unlock longer running routes. The first or second time I ran the short course, I received a message saying that I can now run the longer distance, but the option never appeared. Since then, I've run the short course multiple times, beating my scores, and still no more courses. Any ideas??

Is this for the Basic Run Plus or the Basic Run?

It's the Basic Run Plus

Have you done all the runs in the Basic Run? If not, going back and doing them may help.

Have you followed all the cats in the shorter runs on the Basic Run Plus? If not, follow all the cats and you might unlock the longer runs.

I say 'may' and 'might' here because I don't know, but I think that one or the other of these things might help. Let us know what happens.