There are more legit than semi or Holistic in the area
3 massage addict
250 Taunton Rd E, 1801 Dundas St E, 4160 Baldwin St S,
There is also Whitby Massage Therapy Clinic 519 Dundas St E, they have a team of about 20 masseuses
also Massage Connection 843 King St W, mostly RMTs
there more Legit places as you move towards Whitby
I don't know of a Yan spa near Oshawa the ones i know are in Aurora, Scarborough North York and Cambridge