Maybe the reason that victorian scientists cautioned that weightlifting was bad for women is because they noticed poor women without better options lifting a lot of heavy weights in the course of their labors, and noticing that this seemed to be bad for their health.

Also, is that actually a claim that "victorian science" made? That weight lifting is bad for women? I'm just taking for granted that the person quoted in this BBC documentary is accurately characterizing a commonly-held view among Anglophone scientists of the victorian era - but I haven't looked into this myself. Maybe this was not in fact scientific consensus of the time. Maybe Ruth Goodman is uncritically repeating a myth about what the past thought, rather than what the past actually thought.