IMO, if one is convicted in their conscience that yoga is bad for them, then they shouldn’t do it (I’m one of them). God deals with each of us differently, and if there is no conviction that it is wrong, then it is not wrong.
Our personal experiences/history determines a lot of what is bad or good for us to engage in individually (conscience-wise)...... God knows.... that’s one of the major reasons that it is wrong to judge others... We don’t know their relationship with the Lord.