This game has some odd technical bugs. From what I've seen, backing up your save and deleting the data or switching profiles and deleting the data like you did seem to fix the bugs.
I ran into the bug where if you do too much of the same exercise in a row, it stops tracking your progress. I somehow thought to try another exercise to see if that would move the meter and it fixed the bug. I was lucky. But for a time there I was really pissed.