Yoga word is generated from
sanskrit language word
'yuj'. It means combining the things. i.e. mind+body+spirit.
If anyone don't accept mind or spirit involvement in yoga. They only want physical fitness (i.e. body) then why are they using 'Yoga' word. They should remove yoga word from tags. It is totally misuse of real meaning/concept of 'Yoga'.
How can one change the definition of yoga according to their own convenience. It is surprising. No matter you hold or close that question. But the truth is truth. I know it is physical fitness site. But denying real concept/definition is not also good practice. Instead you can change the tag 'yoga' to something other.
If you only want physical fitness then other many tags are there. Or even they can use only 'power yoga' tag or 'Yoga without spirituality' tag.
Real mining of yoga is union of mind, body and spirit.
[Definition is referred from "Certification of Yoga professionals Official Guidebook" (this is authorized yoga certification book)].